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2012 Aug 10
1
Lavaan: Immediate non-positive definite matrix
Hi,
I recently tried to estimate a linear unconditional latent growth curve on
7 repeated measures using lavaan (most recent version):
modspec='
alpha =~ 1*read_g0 + 1*read_g1 + 1*read_g2 + 1*read_g3 + 1*read_g4 +
1*read_g5 + 1*read_g6
beta =~ 0*read_g0 + 1*read_g1 + 2*read_g2 + 3*read_g3 + 4*read_g4 +
5*read_g5 + 6*read_g6
'
gmod=lavaan(modspec, data=math, meanstructure=T, int.ov.free=F, int.lv.free=
T, auto.var=T, auto.cov.lv.x=T, auto.cov.y=T, missing="direct", verbose=T)
The model immediately returned the fol...