Jon Heron posted on Friday, August 15, 2008 - 5:47 am
I have 3 continuous measures and I am throwing a bunch of different mixtures models at them.
I am fitting two types of LCGA, one with a quadratic describing changes through time and the other a piecewise linear change.
For mixture models with the same number of classes these two models achieve exactly the same fit figures - likelihood, AIC, BIC, aBIC, Entropy (not that surprising)
However, when it comes to BLRT I am finding differences - the BLRT supports the 3 class model for the quadratic LCGA however the conclusions are different for the piecewise model (in fact the BLRT changes are non-monotonic for this model, favouring a 2 or a 6 class).
To make sure that these are not just fluke results I have increased the starts considerably:
I created a 2 class latent class model, and now want to use the classes as independent variables in regression analyses. when i try to save the classes to a file, it will only save variables in the usevariables command, and the classes/cprobs but not the rest of the variables in the original input file. i don't want to add the other variables in usevariables command because they are not relevant to creating the classes. is there a way to do this, or merge the two files? any help is appreciated.