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yuming ning posted on Thursday, November 13, 2008  4:25 pm



i have a simple question for coding my hypothesized model is A>D>E B>D>E A>E B>E C>E hence my codes will be E on A B C D; D on A B; but how do i test A<>B (ie, cov(A,B))? i tried adding (A with B;) into above codes, but the result gave me estimates for all of cov(A,B), cov(A,C), and cov(B,C). i only want cov(A,B) and assume cov(A,C)=cov(B,C)=0 


In regression, the means, variances, and covariances of the covariates are not parameters in the model. The model is estimated conditioned on the covariates. You should not mention a WITH b. If you want to know the correlation between a and b, see the sample statistics. 

Anna posted on Tuesday, June 15, 2010  1:08 pm



I have a question concerning the test of correlations. How do I test if correlations between two latent factors (e.g. between level and slope) are significantly different between groups or time points? Is this possible in Mplus? Thank you very much for your help! 


You can test if the covariances between two growth factors are the same for two groups using either MODEL TEST of chisquare or loglikelihood difference testing. 

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