Request for help with Two Wave SEM PreviousNext
Mplus Discussion > Exploratory Factor Analysis >
Message/Author
 Anirban Chakraborty posted on Thursday, April 06, 2006 - 11:19 pm
I am a doctoral student. For the purpose of my thesis I am trying to estimate a two-wave longitudinal model using SEM. I am using LISREL for the purpose. Please find the code attached here below. My problem is though I am getting good fit indices (Goodness of Fit Index (GFI) = 0.93; Adjusted Goodness of Fit Index (AGFI) = 0.90; Minimum Fit Function Chi-Square = 47.92 (P = 0.97); P-Value for Test of Close Fit (RMSEA < 0.05) = 1.00), I am getting the following warning which I have not been able to resolve:

W_A_R_N_I_N_G: PH 3,1 may not be identified. Standard Errors, T-Values, Modification Indices,and Standardized Residuals cannot be computed.

W_A_R_N_I_N_G: The solution has not converged after 250 iterations.The following solution is preliminary and is provided only for the purpose of tracing the source of the problem. Setting IT>250 may solve the problem.

I had to use the RC option because initially the THETA-EPS matrix was not positive definite. I would be extremely grateful to you if you can kindly help me in resolving the issue.
Warm Regards
-Anirban Chakraborty
Code:

TI Ext

DA NI=14 NO=106 NG=1 MA=KM

RA FI='C:\Documents and Settings\Administrator\Desktop\Ext.psf'

MO NX=6 NY=8 NK=3 NE=5 LY=FU,FI LX=FU,FI BE=FU,FI GA=FU,FI PH=SY,FR PS=DI,FR TE=SY,FI TD=SY,FI

SE

7 8 9 10 11 12 13 14 1 2 3 4 5 6 /

LK

PJ1 IJ1 RE1

LE

SAT1 PJ2 IJ2 RE2 SAT2

FR LX(1,1) LX(2,1) LX(3,2) LX(4,2) LX(5,2) LX(6,3) LY(1,1)LY(2,2) LY(3,2) LY(4,3) LY(5,3) LY(6,3) LY(7,4) LY(8,5) GA(1,1) GA(1,2) GA(1,3) BE(5,1) BE(5,2) BE(5,3) BE(5,4) TD(1,1) TD(2,2) TD(3,3) TD(4,4) TD(5,5) TE(2,2) TE(3,3) TE(4,4) TE(5,5) TE(6,6); VALUE 0.3 TD(6,6); VALUE 0.3 TE(1,1) TE(7,7) TE(8,8)

ST 0.7 LY(1,1)LY(2,2) LY(3,2) LY(4,3) LY(5,3) LY(6,3) LY(7,4) LY(8,5)

ST 0.5 LX(1,1) LX(2,1) LX(3,2) LX(4,2) LX(5,2) LX(6,3)

ST 0.9 TD(1,1) TD(2,2) TD(3,3) TD(4,4) TD(5,5) TE(2,2) TE(3,3) TE(4,4) TE(5,5) TE(6,6)

PD

OU SE TV RS RC=.85 RO SS MI ME=GLS IT=250
 Linda K. Muthen posted on Thursday, April 06, 2006 - 11:25 pm
You will need to send your question to LISREL support.
Back to top
Add Your Message Here
Post:
Username: Posting Information:
This is a private posting area. Only registered users and moderators may post messages here.
Password:
Options: Enable HTML code in message
Automatically activate URLs in message
Action: