# Sample variant of stDev function

**URL:** <https://forum.inductiveautomation.com/t/sample-variant-of-stdev-function/9059>\
**Category:** Ignition\
**Created:** [September 15, 2014, 8:03pm UTC](https://forum.inductiveautomation.com/t/sample-variant-of-stdev-function/9059 "2014-09-15T20:03:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![JordanCClark](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jordancclark/32/83362_2.png) [@JordanCClark](https://forum.inductiveautomation.com/u/JordanCClark)\
**Post date:** [September 15, 2014, 8:03pm UTC](https://forum.inductiveautomation.com/t/sample-variant-of-stdev-function/9059/1 "2014-09-15T20:03:02Z")

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Hi!

Unless I’m missing something, it appears that the stDev expression function is a population standard deviation. Be nice to also have sample standard deviation.

I propose a separate function, like stDevS with the same types of arguments. That way, we don’t inadvertently break any existing code. 'Cause I can break my code just fine all by myself! 😃