# Standard Deviation Function missing in Ignition V8.1

**URL:** <https://forum.inductiveautomation.com/t/standard-deviation-function-missing-in-ignition-v8-1/102619>\
**Category:** Ignition\
**Tags:** ignition81, vision\
**Created:** [February 20, 2025, 1:34pm UTC](https://forum.inductiveautomation.com/t/standard-deviation-function-missing-in-ignition-v8-1/102619 "2025-02-20T13:34:19Z")\
**Posts on this page:** 1\
**Showing post:** 3

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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:** [February 20, 2025, 5:55pm UTC](https://forum.inductiveautomation.com/t/standard-deviation-function-missing-in-ignition-v8-1/102619/3 "2025-02-20T17:55:19Z")

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7.5 was a while ago. Were you by chance using this?

> [@Math Extensions for Ignition](https://forum.inductiveautomation.com/t/math-extensions-for-ignition/3106):
>
> EDIT 2017-07-13: Things have changed enough that this first post is getting revamped. EDIT 2019-08-08: Re-uploaded due to broken link Some useful math functions just aren’t available through scripting. This is an attempt to rectify some of it. Functions: sum mean rectangular-to-polar conversions polar-to-rectangular conversions simple linear regressions polynomial regression greatest-common-denominator least common multiple standard deviation (population and sample) decimal to BCD decimal t…

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