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Hi Linda, I am also using cohort sequential design to obtain grade-based measurements to look at constructs across grade 3-5. Each individual was observed 4 times. I tried to do a LGCM and put some latent outcomes in tis model, but there always some problem about PSI. Could you give them some advice? Here is the warning: WARNING: THE LATENT VARIABLE COVARIANCE MATRIX (PSI) IN GROUP 1 IS NOT POSITIVE DEFINITE. THIS COULD INDICATE A NEGATIVE VARIANCE/ RESIDUAL VARIANCE FOR A LATENT VARIABLE, A CORRELATION GREATER OR EQUAL TO ONE BETWEEN TWO LATENT VARIABLES, OR A LINEAR DEPENDENCY AMONG MORE THAN TWO LATENT VARIABLES. CHECK THE TECH4 OUTPUT FOR MORE INFORMATION. PROBLEM INVOLVING VARIABLE PM. PM is the latent outcome. |
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And here is my code: DATA: FILE IS 555.CSV; VARIABLE: NAMES ARE G r2-r19 n1-n4 g1-g4 z1-z4 jq ss jj sc se ho gu xq lo de sk ax; usevari are G g1-g4 se jq de ax; GROUPING = G (3=1 4=2 5=3); Missing are all (99); ANAL:STARTS=100; MODEL: pm by se jq; nm by de ax; pm @ 0; nm @ 0; i s |g1@0 g2@1 g3@2 g4@3; [i] (1); [s] (2); i (3); s (4); i WITH s (5); pm nm on i s; g3-g4(6-7); MODEL 2: i s |g1@2 g2@3 g3@4 g4@5; g1-g2(6-7); g3-g4(8-9); MODEL 3: i s |g1@4 g2@5 g3@6 g4@7; g1-g2(8-9); g3-g4; OUTPUT: TECH4 MODINDICES (ALL) STANDARDIZED; |
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This statement is strange pm @ 0; nm @ 0; because it says there is no factor variance so the factor does not play a role. Note also that we request that postings be limited to one window. For longer message, send to Support. |
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Thank you very much for your reply£¡ I have deleted the code: pm @ 0; nm @ 0; but same warning is still there for all groups(1-3): WARNING: THE LATENT VARIABLE COVARIANCE MATRIX (PSI) IN GROUP 3 IS NOT POSITIVE DEFINITE. THIS COULD INDICATE A NEGATIVE VARIANCE/ RESIDUAL VARIANCE FOR A LATENT VARIABLE, A CORRELATION GREATER OR EQUAL TO ONE BETWEEN TWO LATENT VARIABLES, OR A LINEAR DEPENDENCY AMONG MORE THAN TWO LATENT VARIABLES. CHECK THE TECH4 OUTPUT FOR MORE INFORMATION. PROBLEM INVOLVING VARIABLE PM. I really don't know where the problem is. Thanks for your help! |
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We need to see the full output - send to Support along with your license number. |
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