Any positive number is fair game.
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The standard deviation is the standard deviation! Its calculation requires no assumption.
Standard error of the mean (SEM) and standard deviation of the mean is the same thing. However, standard deviation is not the same as the SEM. To obtain SEM from the standard deviation, divide the standard deviation by the square root of the sample size.
difference standard deviation of portfolio
The square of the standard deviation is called the variance. That is because the standard deviation is defined as the square root of the variance.
Mean 0, standard deviation 1.