Thresholds fixed at +/-15 PreviousNext
Mplus Discussion > Latent Variable Mixture Modeling >
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 Daniel posted on Wednesday, September 17, 2003 - 12:20 pm
I received the following message in my output. However, none of the thresholds were -15 or 15 in the final estimates. Can I trust my results?

IN THE OPTIMIZATION, ONE OR MORE LOGIT THRESHOLDS APPROACHED AND WERE SET
AT THE EXTREME VALUES. EXTREME VALUES ARE -15.000 AND 15.000.
THE FOLLOWING THRESHOLDS WERE SET AT THESE VALUES:
* THRESHOLD 1 OF CLASS INDICATOR SMOKE12 FOR CLASS C#1 AT ITERATION 10
* THRESHOLD 2 OF CLASS INDICATOR SMOKE12 FOR CLASS C#1 AT ITERATION 10
* THRESHOLD 1 OF CLASS INDICATOR SMOKE12 FOR CLASS C#2 AT ITERATION 2
 Linda K. Muthen posted on Wednesday, September 17, 2003 - 12:54 pm
Please send your output to support@statmodel.com.
 Jessica  posted on Monday, April 03, 2006 - 1:25 pm
Hello. I am running a latent class (2, 3, and 4 classes) analysis with 6 binary indicators. The 2 class analysis ran fine, but for the 3 and 4 class analyses, I received the same message as the previous person. For the 3 class analysis, one threshold 1 error was reported, and for the 4 class analysis, two threshold 1 errors were reported. In the output, these probabilities are fixed to either 1 or 0. Is there anything I can do to "fix" this problem?

Thank you.
 Linda K. Muthen posted on Monday, April 03, 2006 - 1:33 pm
Having thresholds fixed at -15 or +15 is not a problem. It just means that for endorsing that particular item the probability is one or zero in that class. It can be helpful for defining the class.
 Jessica  posted on Monday, April 03, 2006 - 1:45 pm
Thank you. I was just concerned that this was indicating that my model was not identified (although both analyses have fine condition values, standard errors, etc.).
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