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Eun K Um posted on Monday, March 14, 2016 - 1:43 pm
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I did confirmatory factor analysis by using the following input. TITLE: CFA Trimmed Model 1 DATA: FILE IS C:\Mplus\Lewis.dat; VARIABLE: NAMES ARE p d n c s a ne al ai ad se e l; USEVARIABLES ARE p d n c s a ne al ai ad se e l; MODEL: st BY p d n c; dep BY s a; sub BY ne al ai; adh BY ad se; adh ON st dep sub; dep ON st; sub ON st; st dep sub adh ON e l; But I got the following message: WARNING: THE LATENT VARIABLE COVARIANCE MATRIX (PSI) 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 ADH. I don't understand exactly what does it mean and I don't know how to solve the problem. Could you help? |
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Check TECH4 and look for what the message talks about. This means that your model is not suitable for your data and you will have to modify the model. For instance, look at the Modindices. |
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Eun K Um posted on Tuesday, March 15, 2016 - 10:36 am
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Dr. Muthen, Thank you for your response. It is helpful. I added the Modindices as follows: I don't think I added it right way. I could not run this. In addition, how can I add TECH4? TITLE: CFA Trimmed Model 1 DATA: FILE IS C:\Mplus\Lewis.dat; VARIABLE: NAMES ARE p d n c s a ne al ai ad se e l; USEVARIABLES ARE p d n c s a ne al ai ad se e l; MODINCDICES(0); MODEL: st BY p d n c; dep BY s a; sub BY ne al ai; adh BY ad se; adh ON st dep sub; dep ON st; sub ON st; st dep sub adh ON e l; |
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As you see in the UG the TECH4 request is done in the Output command. Modindices is misspelled. |
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Eun K Um posted on Tuesday, March 15, 2016 - 12:20 pm
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Dr. Muthen, Thank you for your response. It is helpful. I added the Modindices as follows: I got this message. TITLE: CFA Trimmed Model 1 DATA: FILE IS C:\Mplus\Lewis.dat; VARIABLE: NAMES ARE p d n c s a ne al ai ad se e l; USEVARIABLES ARE p d n c s a ne al ai ad se e l; MODINDICES(0); MODEL: st BY p d n c; dep BY s a; sub BY ne al ai; adh BY ad se; adh ON st dep sub; dep ON st; sub ON st; st dep sub adh ON e l; *** ERROR in VARIABLE command Unknown option: MODINDICES(0) |
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You should put it in the OUTPUT command not in the VARIABLE command. |
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Eun K Um posted on Wednesday, March 16, 2016 - 1:21 pm
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Dear Dr. Muthen: Thank you for your response. It is very helpful. I got the following output. Can you give me your advice on how I can change model based on the following output? Minimum M.I. value for printing the modification index 0.000 ON/BY Statements DEP ON SUB / SUB BY DEP 0.259 2.196 0.042 0.042 DEP ON ADH / ADH BY DEP 0.259 1.070 999.000 999.000 SUB ON DEP / DEP BY SUB 0.259 0.001 0.052 0.052 SUB ON ADH / ADH BY SUB 0.259 0.012 999.000 999.000 |
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This is a good general analysis question for SEMNET. |
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Eun K Um posted on Thursday, March 17, 2016 - 1:42 pm
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I deleted ADH and did not get the warning that the model is non positive definite. But my residual variances are high. Please see the following: TITLE: CFA Trimmed Model 1 DATA: FILE IS C:\Mplus\Lewis.dat; VARIABLE: NAMES ARE p d n c s a ne al ai ad se e l; USEVARIABLES ARE p d n c s a ne al ai e l; MODEL: st BY p d n c; dep BY s a; sub BY ne al ai; dep ON st; sub ON st; st dep sub ON e l; OUTPUT:TECH4 Residual Variances P 4.017 0.576 6.969 0.000 D 2.812 0.363 7.736 0.000 N 2.251 0.285 7.898 0.000 C 2.528 0.482 5.240 0.000 S 562.290 316.374 1.777 0.076 A 0.333 0.093 3.583 0.000 NE 0.222 0.050 4.460 0.000 AL 969.555 136.641 7.096 0.000 AI 881.951 147.108 5.995 0.000 ST 5.777 1.007 5.735 0.000 DEP 1503.962 345.716 4.350 0.000 SUB 0.671 0.102 6.607 0.000 |
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For general analysis questions that don't relate specifically to Mplus capabilities, please try SEMNET. |
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