Hi,
I have a multilevel situation where subjects are nested within clinics, and each subject has multiple measurements. For simplicity, suppose there 4 clinics, 3 subjects per clinic, and each subject has 3 repeated measures. Outcome is continuous. I am trying to implement this model with lmer function in lme4 library. lmeobj1<-lmer(outcome~med+time+medtime+(time|clinid)+(subjid|clinid)) My data set is as follows: med has two levels, time has three levels, medtime is the interaction between med and time, subjid is the id numbers for subjects, clinid is the id numbers for clinics. I pasted the data below. The above code is giving the same results with fixed effects regression. In addition, whatever I put as random effects is not making a difference at all. What am I doing wrong? >cbind(outcome,med,time,medtime,subjid,clinid) outcome med time medtime subjid clinid [1,] 0.8511317 0 0 0 10 4 [2,] 3.9524773 0 1 0 10 4 [3,] 2.1637332 0 2 0 10 4 [4,] 1.6713403 1 0 0 1 1 [5,] 1.7379582 1 1 1 1 1 [6,] 5.0951544 1 2 2 1 1 [7,] 0.9523377 1 0 0 2 1 [8,] 2.4599613 1 1 1 2 1 [9,] 5.1759744 1 2 2 2 1 [10,] -0.9495338 1 0 0 4 2 [11,] 2.9300264 1 1 1 4 2 [12,] 3.7025651 1 2 2 4 2 [13,] 1.1628554 1 0 0 6 2 [14,] 4.1536130 1 1 1 6 2 [15,] 5.0869188 1 2 2 6 2 [16,] 0.3114241 0 0 0 7 3 [17,] 0.6007636 0 1 0 7 3 [18,] 2.2783941 0 2 0 7 3 [19,] -0.7095164 0 0 0 8 3 [20,] -0.1541448 0 1 0 8 3 [21,] 1.6037837 0 2 0 8 3 [22,] 1.9994632 0 0 0 9 3 [23,] 0.8047261 0 1 0 9 3 [24,] 0.1828438 0 2 0 9 3 [25,] 2.7219649 0 0 0 12 4 [26,] 2.3046305 0 1 0 12 4 [27,] 1.1838549 0 2 0 12 4 [28,] 0.6292358 1 0 0 3 1 [29,] 2.9953366 1 1 1 3 1 [30,] 3.9291266 1 2 2 3 1 [31,] 0.8726671 0 0 0 11 4 [32,] -0.4657651 0 1 0 11 4 [33,] 3.0364098 0 2 0 11 4 [34,] 0.3046405 1 0 0 5 2 [35,] 0.8789185 1 1 1 5 2 [36,] 4.1729769 1 2 2 5 2 Thanks, [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.