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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 Formula. In this formula, x is the value of the mean, N is the sample size, and xi represents each data value from i=1 to i=N.. The â symbol indicates that you must add up the sum. (x1 - x)2 + (x2 - x)2 + (x3 - x)2 + (x4 - x)2 + (x5 - x)2. . . + (xN - x)2.