# STDEVPA

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).

**Syntax**

**STDEVPA**(**value1**,value2, ...)

**Value1**,value2, ... are 1 to 30 values corresponding to a population. You can also use a single array or a reference to an array instead of arguments separated by commas.

**Remarks**

- STDEVPA assumes that its arguments are the entire population. If your data represents a sample of the population, you must compute the standard deviation using STDEVA.
- Arguments that contain TRUE evaluate as 1; arguments that contain text or FALSE evaluate as 0 (zero). If the calculation must not include text or logical values, use the STDEVP worksheet function instead.
- For large sample sizes, STDEVA and STDEVPA return approximately equal values.
- The standard deviation is calculated using the "biased" or "n" method.
- STDEVPA uses the following formula:

**Example**

Using the same data from the STDEVA example and assuming that only 10 tools are produced during the production run, STDEVP measures the standard deviation of breaking strengths for all the tools.

`STDEVP(A2:E3)`

equals 26.05