WorksheetFunction.StDev_P (Excel)
Calculates standard deviation based on the entire population given as arguments. The standard deviation is a measure of how widely values are dispersed from the average value (the mean).
StDev_P assumes that its arguments are the entire population. If your data represents a sample of the population, compute the standard deviation by using StDev_S. For large sample sizes, StDev_S and StDev_P return approximately equal values. The standard deviation is calculated by using the "biased" or "n" method. Arguments can either be numbers or names, arrays, or references that contain numbers. Logical values and text representations of numbers that you type directly into the list of arguments are counted. If an argument is an array or reference, only numbers in that array or reference are counted. Empty cells, logical values, text, or error values in the array or reference are ignored. Arguments that are error values or text that cannot be translated into numbers cause errors. StDev_P uses the following formula, where x is the sample mean AVERAGE(number1,number2,...) and n is the sample size:
StDev_P (Arg1, Arg2, ..., Arg30)
Dim dblStDev_P As Double
dblStDev_P = WorksheetFunction.StDev_P(Arg1:=)