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# STDEV Function

## Estimates the standard deviation based on a sample of values or selected database entries.

 by Charley Kyd, MBAMicrosoft Excel MVP, 2005-2014 The Father of Spreadsheet Dashboard Reports

The standard deviation is a measure of how widely values are dispersed from the average value (the mean).

Syntax

STDEV.S(number1,[number2],...)

• Number1. Required. The first number argument corresponding to a sample of a population. You can also use a single array or a reference to an array instead of arguments separated by commas.

• Number2,... Optional. Number arguments 2 to 254 corresponding to a population. You can also use a single array or a reference to an array instead of arguments separated by commas.

Applies To

Excel 2003 and above.

Remarks

• STDEV is deprecated. Use STDEV.S instead. See What's a 'Deprecated' Function in Excel? for a list of deprecated functions and their replacement.
• STDEV assumes that its arguments are a sample of the population. If your data represents the entire population, you should calculate the standard deviation using STDEV.P.
• The standard deviation is estimated using the "nonbiased" or "n-1" method.
• Arguments can be numbers, names, arrays, or references that contain numbers.
• If an argument is an array or reference, only numbers in that array or reference are counted. Empty cells, logical values, text, or error values in the array or reference are ignored.
• Arguments that are error values or text that cannot be translated into numbers cause errors.
• Cell C7 in the Example below shows an Excel version of the formula for this function, shown here: Examples

You can download this example workbook here, along with all other example workbooks I've completed for this Excel help area. Other Help

Related Functions

For a complete list of related functions, see Microsoft's page of Statistical Functions.   