Whats the motivation to demean variables when estimating an interaction effect?

Asked Aug 06 '20 at 16:21

Active Aug 06 '20 at 16:21

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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

asked Aug 06 '20 at 16:21

Laurie

2

It reduces correlation between main effects and interaction effects. – Michael M Aug 06 '20 at 16:31
3

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. – EdM Aug 06 '20 at 16:38

Whats the motivation to demean variables when estimating an interaction effect?

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