Hi, I appreciate the help.
My attempt to free the third slope parameter isn't working below, while freeing it in MPlus succeeds. Is there another approach I'm not applying to free it? Thanks.
Mod <- '
# intercept and slope with fixed coefficients
i =~ 1*N1T1 + 1*N1T2 + 1*N1T3
s =~ 0*N1T1 + 1*N1T2 + NA*N1T3
#variances
#s~~.001*s
'
fit<-growth(Mod,data,missing='fiml',estimator="MLR",control=list(iter.max=1000))