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I am trying to estimate a regression model where I am interested in the effect of a certain magnitude, probability and expected value (probability * magnitude ) on reaction times. I was told that it is necessary to demean probability and magnitude before estimating its product. Can anyone give me an intuition in why you would use ev=demean(prob)*demean(mag)?

Thanks!

Laurie

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    $\begingroup$ It reduces correlation between main effects and interaction effects. $\endgroup$
    – Michael M
    Commented Aug 6, 2020 at 16:31
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    $\begingroup$ Does this answer your question? Mean centering interaction terms You don't have to, it just puts the single-predictor coefficients into more interpretable ranges. $\endgroup$
    – EdM
    Commented Aug 6, 2020 at 16:38

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