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I fit a GEE model examining the interaction between my predictor: heading quartile (categorical- dummy coded) and a moderator variable: head circumference (continuous).

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I would like to visualize the interaction but am not sure the best way to do so. So far, I have thought of treating head circumference as a factor with three levels (mean, +1sd, -1sd) and plotting one line for each level on a graph of x = heading quartile, y = estimate.

Is this the right way to approach this visualization?

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