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And does anyone know if the same logic applies to a lagged X as predictor of Y? Is this allowed and if yes, what is the best centering method and why?

Thank you!
Paris

That really helps, thank you Chris!

Best,
Paris

Dear MlwiN users,

Suppose we have weekly (or diary) data where a within-level X variable(s) predicts a within-level Y variable. Now I want to create lagged (previous-week) variables for both X and Y and add them as control variables. I have seen in a paper that while lagged Y was grandmean centered ...

Dear Mlwin users,

Have you ever had the following issue?

The variance (estimate) of Level 2 increases when new Level 1 predictors are added in a regression equation (all as predictors of a Level 1 outcome).
I usually have this when all predictors in the equation are at Level 1.

I'm quite puzzled ...