multicon (version 1.6)

popsd: Population Standard Deviation

Description

Returns the population standard deviation of x

Usage

popsd(x, nomiss = 0.8)

Arguments

x

A numeric vector

nomiss

A numeric between .00 and 1.00 specifying the proporiton of valid cases in x (i.e. data that must not be NA) for the sd to be returned

Value

This function returns the population standard deviation.

Details

R's built-in sd function divides the sum of the squared deviations from the mean by the number of observations minus 1 (N-1). However, there are times where one would prefer to use the formula with N in the denominator (e.g. if one is working with the entire population of scores). This function does just that.

See Also

sd

Examples

x  <- rnorm(100, mean = 12, sd = 10)
sd(x) #sample standard deviation
popsd(x) #population standard deviation