Power Analysis Software
This is anecdotal, but for those of you who are getting a step ahead on your research or are at least a little bit interested in stats, I wanted to provide a very useful link for a free power analysis program created by Faul & colleagues specifically for behavioral research. You may or may not note that (maybe Mari can prove me wrong here) that there is no power calculator in the actual SPSS bundled statistical package, but it is provided as separate stand-alone software.
Even if SPSS can provide power analyses, this is a useful stand-alone tool with good instructions and tutorials.
The program is called G*Power. Why it is useful:
1) It can calculate Ns and powers beforehand for research designs you may want to use to achieve an optimal effect size.
2) It is a very powerful program with relatively detailed instructions on its use, and can be used with t-tests, ANOVA, Regression, etc.
3) Once again, it is free.
You can download the program, as well as tutorials and the original published article on its creation here:
posted by Chris @ 5:35 PM
1 Comments:
At 8:03 AM,
Mari said…
G*Power is a great program. I have used it in grant proposals myself.
SPSS can calculate the observed power of an analysis, but this is a little backwards, in my opinion, as the point of a power analysis is to give you an idea if your study *as designed* is likely to be able to yield significant results. (As opposed to if your study as conducted had sufficient power--something that the results tell you anyway...)
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