# Using Natural Logs to calculate percentage change

**URL:** <https://boards.straightdope.com/t/using-natural-logs-to-calculate-percentage-change/316175>\
**Category:** Factual Questions\
**Created:** [August 8, 2005, 8:40pm UTC](https://boards.straightdope.com/t/using-natural-logs-to-calculate-percentage-change/316175 "2005-08-08T20:40:54Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![ultrafilter](https://avatars.discourse-cdn.com/v4/letter/u/3d9bf3/32.png) [@ultrafilter](https://boards.straightdope.com/u/ultrafilter)\
**Post date:** [August 9, 2005, 9:43pm UTC](https://boards.straightdope.com/t/using-natural-logs-to-calculate-percentage-change/316175/21 "2005-08-09T21:43:32Z")

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The page you linked to earlier seems to have an error with the formula for the AGM. The arithmetic and geometric means are both commutative, but the formula they give for the AGM is not. Maybe they’re just missing absolute value signs…

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