## Purpose

## Return value

## Arguments

*number1*- First number or reference in the sample.*number2*- [optional] Second number or reference.

## Syntax

## Usage notes

The STDEV.P function calculates the standard deviation for a sample set of data. Standard deviation is a measure of how much variance there is in a set of numbers compared to the average (mean) of the numbers. The STDEV.P function is meant to estimate standard deviation for an entire population. If data represents a sample, use the STDEV.S function.

*Note: STDEV.P replaces the STDEVP function, with identical behavior. Although STDEVP still exists for backwards compatibility, Microsoft recommends that people use the newer STDEV.P function instead.*

### Standard Deviation functions in Excel

The table below summarizes the standard deviation functions provided by Excel.

Name | Data set | Text and logicals |
---|---|---|

STDEV | Sample | Ignored |

STDEVP | Population | Ignored |

STDEV.S | Sample | Ignored |

STDEV.P | Population | Ignored |

STDEVA | Sample | Evaluated |

STDEVPA | Population | Evaluated |

Notes:

- STDEV.P calculates standard deviation using the "n" method, ignoring logical values and text.
- STDEV.P assumes data is an entire population. When data is a sample only, use the STDEV.S function.
- Numbers are supplied as arguments. They can be supplied as actual numbers, ranges, arrays, or references that contain numbers.
- To evaluate logical values and/or numbers as text in a reference, use the STDEVA function.