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Unlike pandas, numpy will give the standard deviation of the entire array by default, so there is no need to reshape before taking the standard deviation. A couple of additional no#但是同理，如果你想知道中国人的身高标准差（population standard deviation），可以每次采样1000人，采样了100次。 每次采样得出的“身高标å‡`在日常的科研数据处理中，我们经常会接触到方差 (variance/deviation Var)、标准差 (Standard Deviation)、标准误 (Standard Error)和抽样方差 (Sampling V*The population standard deviation, generally notated by the Greek letter lower case sigma, is used when the data constitutes the complete population. It is difficult to answer your-3 You already have some good answers on calculating standard deviation, but Id like to add Knuths algorithm for calculating variance to the list. Knuths algo performs the calcul"Compute mean and standard deviation by group for multiple variables in a data.frame Ask Question Asked 12 years, 11 months ago Modified 4 years, 9 months ago%In Python 2.7.1, you may calculate standard deviation using numpy.std() for: Population std: Just use numpy.std() with no additional arguments besides to your data list. Sample std