Towards the end of the semester

Busy with the final projects. The takeaway from this semester is never picking two 395T courses at the same time. Sorry.

— Update: 01/03/18 —

Last semester ends up amazingly well. Every time I read this post, I always picture Prof. Dana Ballard’s pull-up gesture in my mind and how he compares the difficulty of coursework with the workout in a gym: you always want to lift a heavier weight to gain muscles. For an unknown reason, his voice and pull-up gesture always amuse me.


In relationships: a first taste

It’s October 30th today. I only have one more day left to compose a post for October. Blogging can be very hard during school time because there are endless tasks you need to get done in a timely fashion with certain expected results. Even though I have given up watching videoes, playing video games, writing technical blogs (almost) for this semester, I still want to write something here to keep the blogging trend going: I have written at least one post per month for the past two years. So, here it is.

There are many things happened in October and surprisingly, those things are all about the relationship: I got baptism to become a Christian, which indicates a new relationship with the God; I start seeing a woman, which is a relationship in a normal standard. One thing I am always curious about when I don’t involve those relationships is: how life can be different when you are in a relationship. Most of my knowledge on this matter is from the media and the people I observe. For the relationship with the God, I barely know anything. I haven’t actively thought about this since I graduated from the college and I won’t even think about being a Christian before coming to Austin. For the relationship with a woman, that I have been thinking about quite actively especially when I was a high school student. I always want to know the taste of being with someone. However, quite surprisingly, if you ask me now how life changed after being with God and being with a woman, I would say: the former one is quite significant but the latter one doesn’t change much.

Being with the God

Being with the God is a huge decision to me. I went to a church back in Madison for two years but I could barely feel anything internally. I always treat going church on Sunday morning as a way to sing some songs and take a break from study. However, after arriving in Austin and thanks to some incidents, the picture of God becomes clear to me. I start to feel the life journey I have been through is perfectly designed to me. Attending Madison for undergraduate makes me mentally strong to the setbacks and going back to China for work makes me grow up like an adult and start to learn all the soft skills I previously ignored: communication, love, and family. All those things prepare me to head back to the States and pursue the further study. In addition, I always know that I have sin but I don’t know what way can help me to get rid of that and start a new life. Even worse, I constantly get seduced by Satan to do the things that hurt my friends and my family. I know I’m wrong but the pleasure coming from the crime is just too much and that gives me the pulse to commit again next time. Thankfully, I have the chance to know the God and I get my way out of the vicious cycle.  After becoming a Christian, I learn to view things in God’s view and try to pass the love to others. I learn to forgive the conflict and do things in the honor of God. Thanks to God, he prepares a woman for me.

Being with a woman

Surprisingly, being in a relationship doesn’t change my life that much. I simply have one more person to care about and I need to allocate certain time for that person. This doesn’t differ from spending time with my parents previously. She is a Christian as well and we adhere to the same core values. All the rest of difference seems trivial to reconcile. However, we have been dating for like a month and we are still in the calibration period: we start to know more about each other and be careful with the relationship traps that people usually fall into. However, with the help of the God, I think I’ll be fine.

Does teaching matter?

I really hesitate whether I should spend my precious hours during the working days composing this blog post. However, I feel I should. I wrote down the title several days ago but I felt some pieces were missing to formal a relative concrete post. However, today, the miracle happened and I can finally complete my puzzle.

Several days ago, I feel quite frustrated because there is a homework due for one of my classes and I have no clue how to finish it. I dig into the books on the subject and try to research the solution out. The most frustrating part isn’t the whole process of seeking answers. It from the lectures. The class is quite popular among the CS graduate student and no matter what areas of their research, everyone I know in the program will take this class sooner or later. The professor for the class is quite famous for his research but I have to say that the quality of the teaching is controversial. By controversial, I mean there is a debate in my head on whether his style of teaching is good or not. If you are familiar with Prof. Andrew Ng’s CS229 lecture videos, then his style is exactly opposite of Prof. Andrew Ng’s. Unlike Prof. Andrew Ng’s mathematical teaching style, professor in my class skips most the f derivations of the formulas and in some cases, he will read through the slides and talk loud about some steps of the derivation. He usually ends the 90 minutes lecture 30 minutes early and in-between he may make some jokes or take a diverge into his research areas that might seem related to lecture topic. The good side of his teaching is that he may offer some intuitions or insights on why we perform those steps and sometimes those few words may help you connect the dots. His teaching style may look like a good fit for someone has a solid background in the field but if you are relatively new to the field, you may have some hard time. This “twisted” class partially leads to my question in the title: “Does teaching matter?” For me, under the context of trying to finish the homework, I cannot see any good from my professor’s lecture style.

The reason that I now look quite peaceful in accepting his lecture style is because of some new insights into research. In a nutshell, you just really don’t have enough time getting everything figured out all at once. Once you’re inside the graduate courses, you will start to read research paper immediately. There can be a lot of background knowledge you need to clear up especially you are new to a field. However, can you say “let me take a pause and get everything figured out at the first.”? No! There are unstoppable piles of papers coming to you and all you need is try to iteratively make best out of the paper. If there are mathematical formulas you don’t understand, in most cases, that’s ok as long as you get a big picture of the paper. The formulas matter the most when you actually start to build your own models. But, that’s not like I have to super clear about every bit of variables appeared in the set of formulas. Many of times, you can take them as given and go straight to use them as basic bricks to build your own building. This feels a lot like playing with LEGO: you don’t care how each piece is made of. You simply use them to build your stuff. The way of looking at knowledge is totally different from your undergraduate where you are tested out every bit of information taught in class through the exam. This observation may look easy but it is really hard from psychological perspective especially when you are a strict person who holds tight to your knowledge system. This psychological barrier is hard to break when you have relative enough time to read through a single paper. You may really hog onto the background or related work section of the paper and you may think there is always a piece of information that you find yourself unclear. Then, you take several months to study the material in order to move a few words to the next sentence of the paragraph. That’s exactly the beauty of the graduate school where you get bombarded by the papers. You just simply don’t have enough time to get everything cleared up before moving on. Classes are heavily centered around the papers and you are sort of expected to figure out on your own by adopting an iterative approach to the knowledge understanding. Take PCA algorithm as an example. The first pass of the material may just simply know how to follow the algorithm and implemented it. The second pass of the material may involve understanding the intuition behind the method and some mathematics derivations. The third pass of the material may actually need to dive to figure out every bit of information and so on.

Now, let’s get back to the question: “Does teaching matter?” It is sort of yes and no question depending on the perspective. From the undergraduate perspective, the hand-holding strategy is probably the must because that’s how we help students build the solid knowledge foundation and allow them to have the basic strategies to survive in the water. Now, for graduate students, it’s debatable whether we should go freestyle of teaching like my professor of the class or we still proceed somewhat like hand-holding but with modification. I guess that depends on the information that the instructor wants to deliver: knowledge itself or how the research is done.

P.S. The miracle happened to me today is during the calculus discussion section, a bunch of freshman chats out loud when I try to explain the solution of the problem to the class. That brings me to think whether the education quality of public system relatively weak compared to the private institutions is due to the quality difference of students. People may think that the reason why faculty in public universities don’t really care about teaching that much is due to the lack of the incentives. But, I’m now starting to think whether that also probably involves another party as well: the students who in short give the wrong signals to the faculty who try hard to achieve teaching excellence. That’s probably an another post in the future.


“work-life balance” at school

Everything so far goes great for me. Austin is a nice place: you don’t have to worry about extremely cold weather and unlike Beijing’s summer, the summer here is not about humid air. Everything feels both familiar and strange at the same time. The usual part is that the school life style is the one that I’m most familiar with. However, on the other hand, it feels a little bit strange to me because I become quite okay with working style: you get up, go to work, and after eight hours, you go back home and sleep. To be honest, there isn’t much pressure when you can enjoy your adult single life. You just get out of school, and there is no intensively homework due, and you are free to do whatever you want after work. That’s why I have the opportunity to write bunch of blog posts in the past two years. But, taking a break from work and heading back to school is totally different story. You need to adjust your time schedule back to probably the most intensive and high pressure schedule. There are endless deadlines you have to meet and all of them are quite intense. You cannot say to your professor that due to the limit of resources, you have to push back the GA date of your programming assignment. All in all, you are expected to get the job done in a timely fashion at school (of course, you are also expected this from your boss but lots of factors can make this sentence not strictly hold in a real setting working environment).

That brings up one important issue that people usually emphasize the most when they work: work-life balance. Specifically, under the academia setting, the question becomes:  does work-life balance matter to the students? In my early college year, the answer I’ll give is “No!”. The reasoning is simple: I’m in a state of endless worry. I worry about the job hunting; I worry about I become lazy and don’t make enough out of the expensive tuition and cost of living. So, I spend most of time working at library or labs in the hope of that “hard working” can make myself less anxious. The end result is not good. I can practice this life style until I’m sophomore and I quickly burn out when I’m junior and senior. Those years the intensity of advanced classes and the work in research labs make me breathless. Thanks to the cold weather in Wisconsin, things become even worse: I feel depressed and hopeless. I don’t want to work at all. I end up spending whole days playing video games and I even skip the final exam to my algorithm class in the Fall semester of my junior year.

Now, after two years of work, I gain some new insights from this miserable experience. One thing is about the worry itself. I have been reading Dale Carnegie’s book “HOW TO STOP WORRYING and Start Living“, and in this book, the author says the following:

Clearly, what I needed was a textbook on how to conquer worry – so again I tried to find one. I went to New York’s great public library at Fifth Avenue and Forty-second Street and discovered to my astonishment that this library had only twenty-two books listed under the title WORRY. I also noticed, to my amusement, that it had one hundred eighty-nine books listed under WORMS. Almost nine times as many books about worms as about worry! Astounding, isn’t it? Since worry is one of the biggest problems facing mankind, you would think, would’t you, that every high school and college in the land would give a course on “How to Stop Worrying”? Yet, if there is even one course on that subject in any college in the land, I have never heard of it. No wonder David Seabury said in his book How to Worry Successfully: “We come to maturity with as little preparation for the pressures of experience as a bookworm asked to do a ballet.”

I have strong feelings towards this text. Lots of important lessons are barely taught or even mentioned in school. In most cases, you seem to be expected to find them out on your own from your own experience. It’s a “Swim or Sink” situation. I don’t blame our education system for this because you can hardly come up with a way to teach a course about “worry” with proper assignments and exams. However, those lessons are so crucial to people and you’d better have some tools in your mental toolbox to know how to handle it. Otherwise, sooner or later, some situation or life events will eat you up just like what happened to me in my junior year. There is a sentence from Jesus: “Take no thought for the morrow.”, which gets translated into “Have no anxiety for the tomorrow” in modern English. In other words, we try our best for today and hope for the best. This one is important for me because I don’t want to work ten hours day because of the worry. I want to work ten hours a day because I just want to work on the day.

Work-life balance means important to research as well. There is no doubt that research is a hard job and unquestionably, I will meet various difficulties when working on research projects. However, I want my future self know that even I face challenge in research, I can still have life. I don’t want to put all my eggs in one basket. This is just like researchers want to work on multiple research projects because you always have plan B when one project doesn’t go well. Keeping work-life balance can help you when you start losing faith in this job because, all in all, you still have something left in your pocket.

Leaving IBM

To be honest, this is probably the most difficult post I have ever written. This is majorly because there is a ton of stuff I want to say but I’m unsure whether I should keep them public or should keep it to myself. Another factor that makes this post hard to write is because the span of drafting. I have been drafting this post since April in 2016, right after when I decide to start the whole process of quit-IBM-and-get-a-PhD project.  I used to use this post as a log to record things and feelings when somethings happens around me at IBM. Frankly, if I take a look at the stuff I record (mostly are rantings) retrospectively, lots of stuff still hold but the anger just passes away with the time. So, that year-long drafting really makes me hesitate even more because the mood when those stuff are written are gone. However, two years can be a significant amount of time and quitting IBM can be called “an end of era” and I should give a closure to my happy-and-bitter experience with IBM anyway. So, here it goes.


Thank you, IBM!

I’m really thankful for the opportunities working with IBM. This experience really makes me grow both technically and mentally.  Technical-wise, I have the opportunity to get hands on experience with DB2 development. DB2 as a database engine is extremely complex. It has over 10 million lines of code and it is way beyond the scope of any school project. Working on those projects are quite challenging because there is no way you can get clear understanding of every part of the project. I still remember when I attend the new hire education on DB2, there is one guy says: “I have been working on the DB2 optimizer for over 10 years but I cannot claim with certainty that I know every bit of the component I own.” This fact really shocks me and based upon my experience so far, his claim still holds but with one subtle assumption, which I’ll talk about later. There are lots of tools are developed internally and reading through both the code and tool chains are a great fortune for any self-motivated developers. I pick a lots of skills alongside: C, C++, Makefile, Emacs, Perl, Shell, AIX and many more. I’m really appreciated with this opportunity and I feel my knowledge with database and operating system grow a lot since my graduation from college.

Mentally, there are also lots of gains. Being a fresh grad is no easy. Lots of people get burned out because they are just like people who try to learn swim and are put inside water: either swim or drown. I’m lucky that my first job is with IBM because the atmosphere is just so relax: people expect you to learn on your own but they are also friendly enough (majority of them) to give you a hand when you need help. I still remember my first ticket with a customer is on a severity one issue, which should be updated your progress with the problem daily. There is a lot of pressure on me because I really have no clue with the product at the very beginning. I’m thankful for those who help me at that time and many difficult moments afterwards. That makes me realize how important is to be nice and stay active with the people around you.  Because no matter how good you are with technology and the product, there are always stuff you don’t know. Staying active with people around you may help you go through the difficult moment like this by giving you a thread that you can start at least pull. In addition, participating with toastmasters club really improve my communication and leadership skills and more importantly, I make tons of friends inside the club. Without working at IBM, I probably won’t even know the existence of the toastmasters club. If you happen to follow my posts, you’ll see lots of going on around me when I work at IBM. Every experience you go through offer you a great opportunity to learn and improve yourself. Some people may look at them as setbacks but for me, I look at them as opportunities.


( the picture on the left is all the comments people give to me about my speech and on the right is the awards I have earned inside the club in these two years)

With the help of all those experience, I have developed a good habit of writing blogs (both technical and non-technical), reading books, and keep working out six days per week. All those things cannot be possible if I work at a place where extra hour work commonly happened. I’m very thankful for IBM for this because staying healthy both physically and mentally are super critical for one’s career. Even though those stuff don’t directly come from IBM, but IBM does provide the environment to nurture this things to happen.


IBM has its own problem. The problem is centered around people. There are many words I want to say but I think I’ll keep them secretly but I want to show my point with a picture:


I don’t know why IBM’s term “resource action” on firing employees and the sentence “IBM recognize that our employee are our most valuable resources.” bother me so much. I probably just hate the word “resource” as a way to directly describe people and how this word get spammed so much around IBM. I know everyone working for a big corporation is just like a cog in a machine. However, what I feel based upon lots of things happened around me is that IBM as its attitudes represented by its first-line managers (because those people I commonly work with) makes this fact very explicitly. It hurts, to be honest. No matter how hard you work and no matter how many prizes you have earned for yourself and your first-line manager, you are nothing more than a cog in a machine, which is not worth for high price to have you around because there are many cogs behind you that are ready to replace you. They are much cheaper, much younger, and more or less can work like you because your duty in the machine is just so precisely specified, which doesn’t really depend on how much experience you have had under your belt. To me, that’s devastating.

This leads to the problem that talented people are reluctant to stay with company. My mentor and the people are so good with DB2 have bid farewell to the team. That’s really sad to me because they are the truly asset to the company and the product. The consequence of this is that crucial knowledge is gone with people. Some quirks existing in the product are only known by some people and once they leave the company, the knowledge is gone with them. That makes mastering of the product even harder. That’s the subtle assumption that the person makes during the new hire education and that’s also part of the problem when working with legacy code. The whole legacy code issue is worth another post but one thing I now strongly believe is that any technical problem has its own root cause in company culture and management style. To me, I’m not a guru now but I cannot see the way to become a guru with my current position, which scares me the most

That’s it for this section and I’ll leave the rest to my journal.

书评:《男人的一半是女人》- 张贤亮











“你好了!” 她的声音从很深很深的水底浮了上来。

”是的。。。我也不知道。。。” 我笑了。一种悲切的和狂喜的笑,一种痉挛的笑。笑声越来越大,笑得全身颤抖,笑得流出了眼泪。

“你还。。。能吗?” 水底又浮上来模糊的声音。


书中像这样的描写其实有很多。这对读者来说是一种小刺激。但是,同时我却非常感谢作者这一种坦诚。在那个年代里,可以想象,崇高理想并不会让一个人时刻保持着活下去的冲动。但是,相反,恰恰是这种人性欲望和情感需要才会让人能艰难度过那段时光。老章最开始没有性能力其实并不是老章自身有什么生理问题。恰恰相反,从这次以及老章在林子中和黄香久的一段云雨看出,老章的身体其实一点问题也没有。那么是什么让老章最开始不能的呢?其实是心理上的一种压抑。这点从老章在第一次和黄香久相遇的场景就可以看出。老章和黄香久第一次相遇是黄香久在池塘了洗澡出浴的时候。老章第一次看到女人的裸体 。长时间艰苦的劳动改造和自己的本能让老章想要与她欢愉一番(”开始,我的眼睛总不自觉地朝她那个最隐秘的部位看。“)而黄香久也摆出了一番欲迎还拒的姿态(”她并不急于穿衣服,却聊下手中的内裤,像是畏凉一样,两臂交叉地将两手搭在两肩上,正面向着我。“)。但是老章总后却没有行动,他用自己的理性战胜了自己的欲望,但是与此同时这也给老章带来莫大的内心痛苦:



。。。 那么,刚刚我要是与她媾合了,我就将不成其为我,我今后的命运就可能大大改观–


我对老章这番思想斗争还是颇有感触的。因为,不论在何种年代,做一个好人真的是非常非常的不容易的。有些时候,在生活中你会发现似乎最后总是坏人,不道德的人,没有那么多像老章这种精神束缚的人笑到了最后。就像老章说得那样:“我对自己的行为负责,那么谁又曾对我负过责任?社会的责任似乎就全在于折磨我和迫害我。” Google的名言是“Don’t be evil”。但是,仔细想想,这是一个多么高的道德要求:”倘若我迎了上去,世界也并不会因此更坏些;我转身逃了开区,世界也没有因此变得更好。“ 如何在面对诱惑,面对那些最后 ”be evil”然后获得利益好处的做法,保持一种不作恶的行为准则。这是多么苛刻的要求。最后,也许就像老章那样,不停地去压抑自己,去符合社会所谓的准则,去活下去。但是,这真的是“活着“吗? 我不知道,书中也似乎没有给出这方面的答案。最后,老章为了自己的信念选择了离开黄香久。这也许是老章选择的 “活着”的一种方式。那么,我们自己真正应该以一种怎样的姿态去活着呢? 我还没有一个明确的答案。




Summary of reading: May – July 2017

It’s has been quite a long time since last time I wrote a book review.  This year my goal on goodreads is to finish 30 books and I’m way behind my schedule. In addition, I have been thinking about whether to port my “book review” section in this blog to my technical blog. The reasoning behind it is that I have spending most of time reading technical books and wordpress is not very friendly when drafting a technical-heavy blog (why? see this post). However, when I actually start drafting this post, I realize that book review is not that technical: it involves the mixture of the text from writer, and thoughts and feelings from reader. So, I’ll keep it here. The really downside for keeping the reviews here is that my “bookReview” tag doesn’t really give a list of titles for quick browsing. By the way, I want to thank my work that offers me four hours daily commute that allows me to concentrate on reading.

“The Road Less Traveled: A New Psychology of Love, Traditional Values and Spiritual Growth” by M.Scott Peck

I finish this book maybe May or maybe June. I cannot remember the exact date. That has always been a problem for me because I usually do highlight when I read a book and once I finish it, I want to take note of good points for future reference. This delays the progress of my next book and also messes up my memory on what exactly date I finish the book. This problem usually happens to some book that are worth lots of re-read in the future. “The Road Less Traveled” by M. Scott Peck is exactly one of those books.

I read through the Chinese translation of the book. It’s not a thick book: only around 250 pages for translation edition. To me, this is somewhat a sequel to “There is nothing wrong with you” book even they are from different authors. The problem discuss in this book is about life and love. The theme is truly cliche on some level. When I recommend this book to my friends, some of them even laugh when I do some briefing of the content to them. However, to me, the author does mange to provide some new perspectives to the issue.

The book starts out by emphasizing one important mindset: life is hard. People may often complain about life: “Why this thing happens to me?” “Why can’t I have an easy life like John has?” There is a subtle assumption that people may not be aware of when they say those stuff: they assume that life should be easy. That’s the problem that can cause lots of people’s mental issue. I was shocked when I read this part because it was just so obvious and I had never thought about this. Once you have a really high expectation to life, you cannot easily go through the obstacles you will encounter. However, if you tune down your expectation by accepting the fact that life is hard, then you’ll be in a positive mindset when trouble happens to you because you know this is how the life really is. And more importantly, when you actually achieve something or getting some help from others or something good happens to you, you can appreciate those things to another level. You’ll feel lucky and satisfied. This will make you stronger when face the next obstacles.

Another good point the author makes is about love. Love is a term that is really hard to define. People have been trying thousands of years from many perspectives trying to define it precisely. I think there will never be a universally-accepted definition to this term but we can learn about love based upon each person’s definition. I guess that’s the beauty of love. The definition offered by the author is that one is truly willing to help someone grow. This definition is really new to me but if you take a pause and think about it, it makes sense. Parents show their love to their children by helping them from different perspectives with the hope that their children can grow healthily and have a good life. Lovers care about each other so much that sometimes they may directly point out each other’s weakness. Those scenarios shows the love. However, as pointed out by the author, love is not easy as people may think. I myself face issues with love. Chinese parents are overly critic when their children face the problem and they think criticizing is better than compliment.  That’s not the love as they may think and that causes problems like self-hate as thoroughly explained in the “there’s nothing wrong with you” book. In order to find the cure, the author emphasizes the role of psychiatrist. To the author, one can hardly get cured without the help from psychiatrist. That feels too depressing to me. The author tries to deliver this message by giving out lots of cases that show how he helps his patients to achieve better mental state. I have doubts if this is the only way to the cure especially when the problem for a person isn’t as serious as the patients described in the book.

One thing I realized lately is the role of toastmasters club. Even though the organization is described as a way to help people improve their communication and leadership skill, it can also be thought as a way for people gaining love. In the book, the author explains that listening as a way to show your focus to someone is a crucial way to show your love. That’s why the children requires parents constantly attention.  People in the club pay attention to the speaker and provide positive feedbacks to the speaker as a way to help the speaker acquire self-confidence. This is exactly how people give love to others. With the practice of speech, speakers are no longer afraid of stage is a signal for gaining love. I think the mental issue or whatever problem caused by lacking of love can be cured as long as we can acquire love from outside. Psychiatrist may be an important way but I hardly believe that it’s the only way.

The Lady Tasting Tea: How Statistics Revolutionized Science in the Twentieth Century” by David Salsburg

I know this book since the junior year of college when my PhD roommate carries this book around as a way to take a break from intense research. The title looks interesting to me and one day, I ask him what good about this book. He answers with big smile: “This book is all about gossip in statistics”.  I know back that time he is also taking a statistics course in sociology.

Four years after that conversation, this book never appears in my life again. However, for no reason, his comment about this book, especially the word “gossip”, is engraved on my mind. So, I give it a try once I’m done with “The Road Less Traveled”. This book looks a good fit to me because based upon his comment, it’s not a really technical book that may require a silent study room, pencil and paper. Also, it’s about statistics on some level is exactly what I need because I’m always attracted to the machine learning, which has deep root in statistics.

To be honest, this book is probably not best described by the word “gossip” because there is not really a lot of gossip involved. Although, I do learn that R.A Fisher really dislikes Jerzy Neyman and his “overly-abused” hypothesis testing; Egon Pearson overthrows his father, Karl Pearson’s work. To me, this book is more like a survey of the field with the aim to tell general audience about the development of mathematical statistics. I myself is also part of general audience in the sense that I’m not really into a mathematical-formula-dense book on a noisy subway. From this perspective, I think the author does a very good job by delivering idea of mathematic term without invoking mathematical formulas.  This is particular useful for me because I can get an overview of each component in the field and their connections without studying a great deal of math. Lots of intuitions are actually from seeing “big picture” instead of worrying about some tedious calculation. Another good point of this book is that you can feel the excitement of the development of the field. Scientific development is motivated by the problems. This is especially true with statistics because statistics is essentially about using mathematical tools to discover the true nature of the data. Here, “the true nature” invokes lots of controversy in the field. The author does a good job to naturally develop the story and motivation behind the argument. Each chapter isn’t too long and it is self-contained as a complete story.  One takeaway from reading this book is the idea about mathematical tools. Formulas are just formulas and unlike computer program, I never think about those mathematical formulas as “tools” for statistician to query the data. This has psychological impact on me because thinking about formulas as tools are just not as intimidating as thinking of formulas as formulas. Another good point about this book is that it lets me realize the assumption behind some mostly-commonly used technique, like hypothesis-testing. Every tool has its assumption, and it’s danger to abuse it without knowing what’s the motivation behind the invention of the tool.

This book is definitely the book I’ll revisit a lot and I think it can be used to its full potential while you taking a class in statistics when you read the book.