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s(x) is the standard deviation of a sample of data. S is the standard deviation of the entire population of your sample. If youre looking for the standard deviation or volatility of stocks, hereâs a blog which includes a table with all of the equa...
Standard Deviation Formula. The standard deviation formula is similar to the variance formula. It is given by: Ï = standard deviation. xi = each value of dataset. x (with a bar over it) = the arithmetic mean of the data (This symbol will be indicated as mean from now). N = the total number of data points.