Summary Measures in Business Analytics

Summary Measures in Business Analytics: location measures, measures of dispersion, shape, and association; boxplots and z scores.

5 min read
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Ways to Speed Up R

Speeding up R computation for simulation or package purposes.

3 min read

The year changed Tech dramatically 2007

Several big innovations that benefit you most

When you talk about the new Netflix series “House of Cards” on your iPhone 7 plus in you left hand, you may find more and more people on the street are using fancy Android mobile phone which makes you worry about whether the next generation of iPhone is worth to buy. Likewise, some easily missed technologies that benefit you a lot such as AWS, Prime Video also initiated in the same year, 2007. You may get used to them today and think that they are necessary parts of your daily life. But before 2007, they all are bound by network infrastructure.

Things are changed due to the network upgrade and launch of the App Store.

It’s intuitive to think that the expansion of statistical learning algorithms and computational power will promote the next upheaval in human society. The popularity of AI is based on mathematics, statistical methods but not limited to those narrow nature sciences which we know for centuries. Without the healthy development of these “next-generation infrastructure”, just think of it as a body but no sapiential “brain”. Without the “brain”, the AI, VR, Google Brain, Smart City wouldn’t come true.

All human knowledge as a whole will be evolved to break the boundaries that we think they are, no matter good or bad. Nature selection over the past billions of years was only led by a randomly utilizing process that optimal the number of species or just live or die. The development of AI will dwarf this complicated but not sole evolution path. The rule and the destination are rooted in the whole design of the fate of AI. The evil idea leads to releasing of demons, whereas optimizing human knowledge could lead to a world with sophisticated but elegant knowledge object.


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The Sample Selection Model

Sample selction is also called as incidental truncation. Simply say, it means the sample was not randomly selected from the total population. Some specific sample are neglect when research is collecting samples.

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Start Python!

“Programming is fun, when the work is done. If you wanna your work is also fun: Use Python!!” LOL

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参数: wc -m 字数

wc -l 行数

wc -w 词数


I am a master, and my major is Statistics. I want to be a great people.


~1 min read

解决了LaTeX_CLASS:article 中colorlinks的问题



所以多方找如何能够自动更改article的,就是找不到如何改模板能自动将: usepackage{hyperref}变为usepackage[colorlinks=true]{hyperref},未 得解。




发现本来就包含#+LaTeX_CLASS_OPTIONS: [colorlinks]这样就能够直接将 这个options加入tex文件中,一切轻而易举的解决了。

这下可以生成tex文件,用xelatex编译包含xeCJK包的tex文件了,中文再 也不是问题。

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TED2013 Meg Jay: Why 30 is not the new 20?

Thirty is not a new 20, so claim your adulthood, get some identity capital, use your weak ties, pick your family. Don’t be define by what you didn’t know or didn’t do.* *You’re deciding your life right now.

1 min read
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