# @STDEVP

Calculates the standard deviation of the specified data set (expList).

Syntax

`@STDEVP (SKIPNONE | SKIPMISSING | SKIPZERO | SKIPBOTH, expList)`
Parameter Description

SKIPNONE

Includes all cells specified in expList, regardless of their content, during calculation of the standard deviation.

SKIPMISSING

Excludes all #MISSING values from expList during calculation of the standard deviation.

SKIPZERO

Excludes all zero (0) values from expList during calculation of the standard deviation.

SKIPBOTH

Excludes all zero (0) values and #MISSING values from expList during calculation of the standard deviation.

expList

Comma-delimited list of member specifications, variable names, functions, or numeric expressions. expList provides a list of numeric values across which the standard deviation is calculated.

Notes

@STDEVP calculates the standard deviation of the specified data set (expList). The calculation is based upon the entire population. Standard deviation is a measure of how widely values are dispersed from their mean (average).

This function assumes that expList represents the entire population. If you want expList to represent a sample of a population, use @STDEV. For large samples, the functions return similar values.

@STDEVP is calculated using the "biased" or "n" method.

@STDEVP uses the following formula:

Example

The following example is based on the Sample Basic database. Assume that the Measures dimension contains an additional member, Std Deviation. This example calculates the standard deviation (based on the entire population) of the sales values for all products and uses the @RANGE function to generate expList.

```FIX (Product)
"Std Deviation" = @STDEVP(SKIPBOTH,@RANGE(Sales,@CHILDREN(Product)));
ENDFIX```

This example produces the following report:

```                              Jan    New York
Actual     Budget
======     ======
Sales           Colas         678        640
Root Beer     551        530
Cream Soda    663        510
Fruit Soda    587        620
Diet Drinks   #MI        #MI
Product    2479       2300

Std Deviation   Product        52.59      55.90```