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In defence of preregistration

Psychbrief has a great rebuttal to a recent paper arguing against pre-registration. Go read it!

PsychBrief

This post is a response to “Pre-Registration of Analysis of Experiments is Dangerous for Science” by Mel Slater (2016). Preregistration is stating what you’re going to do and how you’re going to do it before you collect data (for more detail, read this). Slater gives a few examples of hypothetical (but highly plausible) experiments and explains why preregistering the analyses of the studies (not preregistration of the studies themselves) would not have worked. I will reply to his comments and attempt to show why he is wrong.

Slater describes an experiment where they are conducting a between groups experimental design, with 2 conditions (experimental & control), 1 response variable, and no covariates. You find the expected result but it’s not exactly as you predicted. It turns out the result is totally explained by the gender of the participants (a variable you weren’t initially analysing but was balanced by chance). So…

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