R: Getting and Cleaning Data

August 2, 2014 35 minute read

What are Confounding Factors and How do they Affect Studies?

August 1, 2014 2 minute read

confound 的意思是：

What are the differences among different study designs, and what are the relative advantages of each?

July 31, 2014 11 minute read

摘自 What are the differences among different study designs, and what are the relative advantages of each?。做目录并排版。 1. Two Classic Types of Studies The two ...

An Example of Experimental Design

July 31, 2014 less than 1 minute read

Question: Does changing the text on your website improve donations?

Types of Data Science Questions

July 29, 2014 2 minute read

摘自 Six Types Of Analyses Every Data Scientist Should Know 和 Types of Questions；两者内容基本相同。

R console theme

July 26, 2014 less than 1 minute read

R console 并没有提供 theme 选项，只有自己配 color。在 “X:[R-folder]\etc\Rconsole” 文件中可以指定 color（在 ## Colours for console and pager(s) 小节）（color 的名称在 “X:[R-folder]\etc\rgb.t...

Octave: fmincg and Anonymous Functions

July 26, 2014 less than 1 minute read

One-vs-all Classfication 的作业里用到了 fmincg，但是语法有点奇怪：

R Generating Random Numbers and Random Sampling

July 8, 2014 3 minute read

R Debugging

July 8, 2014 1 minute read

1. log

Derivative and Partial Derivative

July 6, 2014 1 minute read

感谢 良田围 网友在 偏导数有什么用 问题上的精彩回复，以下全文摘抄，仅加音标并稍微排版。