Re: [AUDITORY] stats use in psychology and hearing science (Daniel Oberfeld )

Subject: Re: [AUDITORY] stats use in psychology and hearing science
From:    Daniel Oberfeld  <oberfeld@xxxxxxxx>
Date:    Tue, 25 Jun 2013 09:25:03 +0200

Dear list, important topic! A related while probably less general problem is that data from repeated-measures / within-subjects designs (that is, when a subject is tested in more than one experimental condition) are sometimes not analyzed properly. I've seen quite a few papers in hearing science where the authors used an ANOVA for completely randomized / between-subjects design for repeated-measures data (you can spot this problem by examining the degrees-of freedom for the F-tests), or fail to use the appropriate repeated-measures ANOVA approach (e.g., apply no correction for the degrees-of-freedom when using a univariate approach). Another point that should be considered is that while for between-subjects designs the general linear model is very robust against non-normality, this is unfortunately *not* the case for repeated-measures designs. Therefore, when analyzing non-normal data like error rates, percent correct or response times from a within-subjects design, the p-values you get from the rmANOVA could be either on the conservative or on the liberal side. You can find an in-depth discussion of these issues in a recent paper from my lab ( Best Daniel -- PD Dr. Daniel Oberfeld-Twistel Johannes Gutenberg - Universitaet Mainz Department of Psychology Experimental Psychology Wallstrasse 3 55122 Mainz Germany Phone ++49 (0) 6131 39 39274 Fax ++49 (0) 6131 39 39268

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