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Topic: post hoc power analysis of t-test
Replies: 2   Last Post: Jan 17, 2013 6:32 PM

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Jeff Miller

Posts: 99
Registered: 12/18/04
Re: post hoc power analysis of t-test
Posted: Jan 17, 2013 6:32 PM
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On Thursday, January 17, 2013 11:42:07 PM UTC+13, Keren wrote:

> I have to groups that differ in their mean values. Using the ttest2 function I performed the t test but now I am having trouble calculating the power of my analysis


These articles may help you:

Froman, T., & Shneyderman, A. (2004). Replicability reconsidered: An excessive
range of possibilities. Understanding Statistics, 3, 365-373.

Yuan, K.-H., & Maxwell, S. (2005). On the post hoc power in testing mean
differences. Journal of Educational and Behavioral Statistics, 30 (2), 141-167.

I'm pretty sure that one will tell you how to compute post-hoc power for your situation, but also that both will tell you it's a useless and misleading thing to compute. (sorry)

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