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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...
The standard deviation is the square root of the variance. The variance is an average of the squared deviations from the mean: s 2 = (x â x) â 2 n â1, where n is the sample sizeYou are probably wondering why we divide by n â1 in computing the average rather than by n. Here is an explanation.