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
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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 notes: The numpy approach here is a bit faster than the pandas one, which is generally true when you have the option to accomplish the same thing with either numpy or ...