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 Login George posted on Wednesday, June 15, 2016 - 5:52 pm
Hello,

I would like to constrain a negative residual variance to be greater than zero in a bifactor exploratory structural equation model. However, when I constrain the variance, I am getting the message that the model may not be identified.

Can someone please take a look at my syntax (below) and tell me if my syntax is incorrect?

Is it possible to constrain a residual item variance in a bifactor model without running into identification issues?)?

Thanks.

Model:

MNG by MEM1 MEM2 MEM3 MEM4 MEM5 MEM6 MEM7 MEM8 MEM9 MEM10 MEM11 MEM12 MEM13 MEM14 MEM15 MEM16 MEM17 MEM18 MEM20 (*1);

MILj by MEM8 MEM11 MEM15 MEM20 MEM1~0 MEM7~0 MEM9~0 MEM12~0 MEM17~0 MEM3~0 MEM5~0 MEM6~0 MEM10~0 MEM14~0 MEM2~0 MEM4~0 MEM13~0 MEM16~0 MEM18~0 (*1);

COMP by MEM1 MEM7 MEM9 MEM12 MEM17 MEM3~0 MEM5~0 MEM6~0 MEM10~0 MEM14~0 MEM2~0 MEM4~0 MEM13~0 MEM16~0 MEM18~0
MEM8~0 MEM11~0 MEM15~0 MEM20~0 (*1);

PURP by MEM3 MEM5 MEM6 MEM10 MEM14 MEM1~0 MEM7~0 MEM9~0 MEM12~0 MEM17~0 MEM2~0 MEM4~0 MEM13~0 MEM16~0 MEM18~0
MEM8~0 MEM11~0 MEM15~0 MEM20~0 (*1);

MATT by MEM2 MEM4 MEM13 MEM16 MEM18 MEM1~0 MEM7~0 MEM9~0 MEM12~0 MEM17~0 MEM3~0 MEM5~0 MEM6~0 MEM10~0 MEM14~0
MEM8~0 MEM11~0 MEM15~0 MEM20~0 (*1);

!labeling and model constraint
MEM8(resMEM8);

MODEL CONSTRAINT:
0 < resMEM8;
 Bengt O. Muthen posted on Wednesday, June 15, 2016 - 6:07 pm
Please send the outputs with and without the constraint, your data, and license number to Support.
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