2019年2月11日
[Python Cookbook] Pandas Groupby
摘要： Groupby Count The command returns a series where the index is the name of a Party and the value is the count of that Party. Note that the series is or 阅读全文
posted @ 2019-02-11 01:30 Sherrrry 阅读(275) 评论(0) 推荐(0)
[Python Cookbook] Dictionary
摘要： Create a Dictionary from a Table 阅读全文
posted @ 2019-02-11 00:51 Sherrrry 阅读(87) 评论(0) 推荐(0)
[Python Cookbook] Pandas: Indexing of DataFrame
摘要： Selecting a Row or Selecting a Column Or Selecting an Element Selecting Multiple Discontinuous Rows Or E.g. 阅读全文
posted @ 2019-02-11 00:47 Sherrrry 阅读(110) 评论(0) 推荐(0)
2019年2月7日
[Math Review] Statistics Basic: Estimation
摘要： Two Types of Estimation One of the major applications of statistics is estimating population parameters from sample statistics. There are types of est 阅读全文
posted @ 2019-02-07 08:26 Sherrrry 阅读(360) 评论(0) 推荐(0)
[Math Review] Statistics Basic: Sampling Distribution
摘要： Inferential Statistics Generalizing from a sample to a population that involves determining how far sample statistics are likely to vary from each oth 阅读全文
posted @ 2019-02-07 00:38 Sherrrry 阅读(274) 评论(0) 推荐(0)
2019年1月30日
[Python Cookbook] Pandas: 3 Ways to define a DataFrame
摘要： Using Series (Row-Wise) Using Series (Column-Wise) Using Dictionary (Columnwise) Using Nested Dictionary The outer dictionary is columnwise and the in 阅读全文
posted @ 2019-01-30 02:30 Sherrrry 阅读(266) 评论(0) 推荐(0)
2019年1月20日
[Math Review] Linear Algebra for Singular Value Decomposition (SVD)
摘要： Matrix and Determinant Let C be an M × N matrix with real-valued entries, i.e. C={cij}mxn Determinant is a value that can be computed from the element 阅读全文
posted @ 2019-01-20 06:56 Sherrrry 阅读(322) 评论(0) 推荐(0)
2019年1月19日
[Python Debug] SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame.
摘要： I Got a SettingWithCopyWarning when I ran the following code: The details of the Warning are : Then I got the inspiration from https://stackoverflow.c 阅读全文
posted @ 2019-01-19 11:53 Sherrrry 阅读(1391) 评论(0) 推荐(0)
2019年1月11日
[Python Debug] How to install external python package? MAC系统下的xgboost安装
摘要： 从昨天晚上开始安装xgboost，经历了各种稀奇古怪的错误，终于现在程序可以跑起来了。整个过程对python编译环境，路径设置，package安装方法有了一定了解，当然还有一些疑惑，所以姑且做个记录。 系统：Mac OS Mojave 10.14 IDE：Anaconda （严格来讲，Anacond 阅读全文
posted @ 2019-01-11 01:23 Sherrrry 阅读(896) 评论(0) 推荐(0)
2019年1月5日
[Python Cookbook] Numpy: Multiple Ways to Create an Array
摘要： Convert from list Apply np.array() method to convert a list to a numpy array: Apply np.array() method to convert a list to a numpy array: Apply np.arr 阅读全文
posted @ 2019-01-05 11:26 Sherrrry 阅读(205) 评论(0) 推荐(0)