Loglikelihood replication PreviousNext
Mplus Discussion > Latent Variable Mixture Modeling >
 Daniel Seddig posted on Saturday, February 20, 2010 - 3:29 am
I am runnig a LCGA (negative binomial with zero inflation) for 5 waves of data. The output for the favourite 6 class solution shows that exact the loglikelihood value is not exactly replicated (10 best value see below; STARTS option was finally set to 500 50). but interestingly the usual warning („THE BEST LOGLIKELIHOOD VALUE WAS NOT REPLICATED“) does not appear. Using the associated seed value for further analyses lead to calculational problems. So i am thinking to accept this solution. Now, could it be that the loglikelihood values are too close together to suggest that the solution is not trustworthy and reached a local maximum? I suggest there is no rule of thumb to decide how many replications are desirable.

-10087.723 393232 152
-10088.132 957392 79
-10088.138 391179 78
-10089.617 414828 322
-10089.618 636396 168
-10089.618 804561 59
-10089.618 364676 27
-10089.618 188498 258
-10089.618 903420 5
-10089.618 789985 67

Finally, what kind of dispersion-index is used in „nbi“ models?
 Linda K. Muthen posted on Saturday, February 20, 2010 - 9:27 am
It sounds like you are using numerical integration. With numerical integration, the check of the closeness of loglikelihoods is less strict. Please send your full output and license number to support@statmodel.com.

Mplus uses alpha as described in the Hilbe book. See the Topic 2 course handout.
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