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Revision 7 as of 2008-09-12 12:20:33

location: FAQ / effcis

A guide to obtaining confidence intervals for effect sizes

Effect sizes, specify the magnitude of a statistical comparison. However, this does not tell us how precisely it is measured.

There are [http://www.latrobe.edu.au/psy/esci/ details by Geoff Cumming] and Steiger (2004) on combining these concepts by giving confidence intervals for effect sizes. Michael Smithson [https://www.anu.edu.au/psychology/people/smithson/details/CIstuff/CI.html has syntax] in SPSS and other statistical software to do the computations. There are also some [https://www.anu.edu.au/psychology/people/smithson/details/CIstuff/Noncoht2.pdf workshop notes] to explain what's going on.

There is also [http://core.ecu.edu/psyc/wuenschk/SPSS/SPSS-Programs.htm SPSS syntax], with an example, for obtaining a confidence interval for Cohen's d.

Reference

Steiger, JH (2004) Beyond the F Test: Effect Size Confidence Intervals and Tests of Close Fit in the Analysis of Variance and Contrast Analysis. Psychological Methods 9(2) 164-182.