

LL difference testing between two models 

Message/Author 

Johnny Wu posted on Tuesday, November 21, 2006  7:55 am



Dr. Muthen, The "Difference Testing Using the Loglikelihood" strategy applies for testing a more restricted model vs. a more freed model. However, what if I want to test two models that have the same variables, same parameters, but different restrictions. Because p0p1 = 0, I cannot use the difference testing formula. For example, I have an i & s, and two covariates x1 & x2. The models that I wish to compare are: (1) i ON x1 x2@0; s On x1 x2@0; vs. (2) i on x1@0 x2; s on x1@0 x2; How would I determine which is a better fit? Thanks, johnnywu 


You can compare the loglikelihoods  I know of no test. You can also use Model test and impose the restrictions in (1) and in (2) and compare those p values. 

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