I am running 3 reciprocal effects models and have 4 waves of data. Each model is based on 2 of 4 groups. My first model (syntax in next post; 643 cases) includes groups 1 and 3; the second (460 cases), groups 2 and 3; and the third (1101 cases), groups 3 and 4. My MODEL syntax is is similar for all 3 models.
With my first 2 models (but not the third), I get the following error message: THE MODEL ESTIMATION TERMINATED NORMALLY THE STANDARD ERRORS OF THE MODEL PARAMETER ESTIMATES MAY NOT BE TRUSTWORTHY FOR SOME PARAMETERS DUE TO A NON-POSITIVE DEFINITE FIRST-ORDER DERIVATIVE PRODUCT MATRIX. THIS MAY BE DUE TO THE STARTING VALUES BUT MAY ALSO BE AN INDICATION OF MODEL NONIDENTIFICATION. THE CONDITION NUMBER IS 0.100D-10. PROBLEM INVOLVING PARAMETER 265. The parameter is not always the same. Can you please advise me where Iím going wrong?
This is the syntax referred to in the previous post. (Structural component not included & only 2 time waves shown)
RvHac on MasVog MasVAng SES; MSCT1 on RvHac MasVog MasVAng SES; MSCT1 with MACHT1; MACHT1 on RvHac MasVog MasVAng SES;
MSCT2 on MSCT1 RvHac MACHT1 MasVog MasVAng SES; MSCT2 with MACHT2; MACHT2 on RvHac MACHT1 MSCT1 MasVog MasVAng SES;
Where: RvHac = the group contrast variable (the USEOBSERVATONS command also used) MasVog and MasVAng = 2 culture variables operationalised using 2 contrasts SES = continuous variable MSCT1, MSCT2 = math self-concept times 1 and 2 MACHT1, MACHT2 = math achievement times 1 and 2.