Vlad posted on Wednesday, August 04, 2010 - 4:25 am
Hello, I have a message from Mplus "WARNING: THE BEST LOGLIKELIHOOD VALUE WAS NOT REPLICATED. THE SOLUTION MAY NOT BE TRUSTWORTHY DUE TO LOCAL MAXIMA. INCREASE THE NUMBER OF RANDOM STARTS." I tried to increase the number of classes it didnt help. I would like to know what the potential sources of this message (besides local max.) and how to solve it.
Jon Heron posted on Wednesday, August 04, 2010 - 4:34 am
do you really mean that you tried to increase the number of classes??
Vlad posted on Wednesday, August 04, 2010 - 5:06 am
hi Jon, yes.
Jon Heron posted on Wednesday, August 04, 2010 - 5:32 am
OK, thanks for the clarification
The more complex your model, the higher the chance you will get your error about the best log-likelihood not being replicated.
By more complex I mean - more measures (e.g. more time points) - more growth factors e.g. quadratic instead of linear - more classes - missing data (FIML) instead of complete-case - probably depends on sample size too
As you pile on the complexity, you need to do more runs with different starting values to avoid the warning you mentioned.