LISREL help!

#1
Dear all,

I would like to perform a CFA (31 items, 5 factors, 126 subjects) in LISREL using the code underneath.
However, after the lambdas are calculated this message is given:

W_A_R_N_I_N_G: PSI is not positive definite

F_A_T_A_L E_R_R_O_R: Unable to start iterations because Fitted

Covariance Matrix is not positive definite.

Please provide better Starting Values

I am not sure what to do, I think the problem might be that some values in my cov matrix are negative.. But how can I solve this problem?

Thanks a lot for thinking along!

Sanne

cm sy file=cov_iptskills


mo ly=fu,fi ps=sy,fi te=sy,fi ny=31 ne=5

le
generalskills grief interpconflict interptransition interpdeficit

pa ly
1 0 0 0 0
1 0 0 0 0
0 1 0 0 0
0 0 1 0 0
0 0 0 1 0
0 0 0 0 1
0 0 0 0 1
0 1 0 0 0
0 0 1 0 0
0 0 0 1 0
0 0 0 0 1
1 0 0 0 0
1 0 0 0 0
0 1 0 0 0
0 0 1 0 0
0 0 0 1 0
1 0 0 0 0
1 0 0 0 0
1 0 0 0 0
0 0 1 0 0
0 0 0 0 1
1 0 0 0 0
1 0 0 0 0
0 0 0 1 0
1 0 0 0 0
1 0 0 0 0
0 1 0 0 0
0 0 0 1 0
0 0 1 0 0
1 0 0 0 0
1 0 0 0 0


pd
ou rs