Step and stepAIC
Jun Shen <jun.shen.ut <at> gmail.com> writes:
lme(biomarker~Cmax+AGE,data=cov,method='ML',random=~1+AGE|ID,keep.data=T) Warning message: In lme.formula(biomarker ~ Cmax + AGE, data = cov, method = "ML", : Fewer observations than random effects in all level 1 groups
That's why the posting guide says: tell the whole story. After that warning, expect everything. You want too much from your data. Dieter