## Summary

The Excel STDEV.S function calculates the standard deviation for a sample set of data. STDEV.S replaces the older STDEV function, with the same behavior.

## Purpose

Get the standard deviation in a sample

## Return value

Estimated standard deviation

## Syntax

=STDEV.S (number1, [number2], …)

## Arguments

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

## Usage notes

The STDEV.S function calculates the standard deviation in a sample set of data.

*Note: STDEV.S replaces the older STDEV function, but has identical behavior. Although STDEV still exists for backwards compatibility, Microsoft recommends that people use the newer STDEV.S function instead.*

Notes:

- STDEV.S calculates standard deviation using the “n-1” method.
- STDEV.S assumes your data is a sample only. When your data is complete (i.e. when your data representations the entire population), calculate standard deviation using the STDEVP.P function.
- Numbers are supplied as arguments. They can be supplied as actual numbers, ranges, arrays, or references that contain numbers.
- The STDEV.S function will include numbers entered as text and logical values when they are entered directly as arguments. However, when an argument is an array or reference, empty cells, logical values, text, and error values are ignored.
- When you want to include logical values and/or numbers as text in a reference, use the STDEVA function.