Purpose
Return value
Syntax
=STDEVP(number1,[number2],...)- number1 - First number or reference in the sample.
- number2 - [optional] Second number or reference.
How to use
The STDEVP function calculates the standard deviation for an entire population. 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 STDEVP function is meant to estimate standard deviation for an entire population. If data represents a sample, use the STDEV function.
Note: STDEVP has been replaced with a newer function called STDEV.P, which has 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:
- STDEVP calculates standard deviation using the "n" method, ignoring logical values and text.
- STDEVP assumes your data is the entire population. When your data is a sample set only, calculate standard deviation using the STDEV function (or its more current replacement, the STDEV.S function).
- Numbers are supplied as arguments. They can be supplied as actual numbers, ranges, arrays, or references that contain numbers.
- The STDEVP function ignores logical values and text. If you want to include logical values and/or numbers as text in a reference, use the STDEVA function.
STDEVP function examples
Standard deviation calculation
Related functions
STDEV Function
The Excel STDEV function returns the standard deviation for data that represents a sample. To calculate the standard deviation for an entire population, use STDEVP or STDEV.P.
STDEV.S Function
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.
STDEV.P Function
The Excel STDEV.P function calculates the standard deviation for a sample set of data. STDEV.P calculates standard deviation using the "n" method, ignoring logical values and text.
