how is cross level interaction implemented is cross level interaction useful what type of interaction is cross level is it useful to include cross-level interaction in multilevel models without varying slopes? why is cross level interaction useful can r be fitted with cross level interaction without varying slope how to model cross level interaction in r r can you use interaction as an example which of the following is useful when modeling cross-level interactions cross level interaction definition is cross level interaction useful r what type of interaction has a varying slope cross-level interaction in multi-level models without varying slope how to include cross level interaction in r cross level interactions definition r how to include cross level interaction r what is cross level interactions in r what is the varying slope of the interaction what is cross level interaction in multilevel what is the difference between a cross-level interaction and a multi-level interaction? quizlet