HLM

A tutorial on how to do a multilevel analysis with cross-level interaction in HLM has now also been uploaded here.

MPLUS

A tutorial on how to do a multilevel analysis with cross-level interaction in Mplus has now also been uploaded here.

R

Tutorial on how to do multilevel analyses with cross-level interaction in R in both a Frequentist (LME4) and Bayesian (BRMS) way can be found on the website of Rens van de Schoot.