I am writing to verify the syntax that I am using to test a 3-level > model with a random intercept at the second level (participant in my > model) versus a model with a random slope and intercept at this > level. Specifically, I am testing a 3 level model in which time > (WEEK) is nested in participants (PARTICIP) and participants are > nested in dyads (DYADID). The goal is to examine how an interpersonal > style (CORUMTO) one week predicts changes in depression the following > week (BDIAFTER) controlling for levels of depression (BDI) from the > previous week. > > I want to verify that the following syntax would be appropriate > for modeling a random intercept and fixed slope at the participant > level and a random slope and intercept at the participant level > > both<-lme(BDIAFTER~BDI+WEEK+CORUMTO, random=list(DYADID=~1, > PARTICIP=~CORUMTO), data=weeklydata) > > > Also, when modeling a random slope and intercept at the participant > level, I receive output, and I also receive the following error > messageĀ > > Warning message > Fewer observations than random effects in all level 2 groups > > I was wondering what this error message means and if it may be > suggesting that the results after the summary statement are > incorrect. > > I also want to verify that the following syntax is appropriate for > modeling just a random intercept (and a fixed slope) at the dyad > and participant levelsĀ > > intercept<-lme(BDIAFTER~BDI+WEEK+CORUMTO, random=list(DYADID=~1, > PARTICIP=~1), data=weeklydata) > > Any advice you can give would be much appreciated. > > Thank you for your time. > > Sincerely, > Christine Calmes > > Christine Calmes, M.A. > Doctoral Candidate, Clinical Psychology > University at Buffalo: The State University at New York > Department of Psychology; Park Hall > North Campus > Buffalo NY, 14260 > > >
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