Calculate the population standard deviation of x Usage popsd(x)

1 | ```
popsd(x, nomiss = 0.8)
``` |

`x` |
A numeric vector |

`nomiss` |
A numeric vector specifying the proporiton of valid cases in x (i.e. data that must not be NA) for the sd to be returned |

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.

Borrowed from Ryne Sherman on 2012/09/06

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