Fitting AR1 structure with residual correlations

[AMANDA MONTOYA]

Hi All,

I'm working with a latent growth curve model and want to add an AR1 correlated residual structure. I can easily add residual covariances, and I could force them to be equal, but I would prefer to force the correlations to be equal rather than the covariances. However, it seems that when I try to code in the constraint using the covariances and variances, lavaan has a hard time with that constraint. Any suggestions? 

Amanda

[Jeremy Miles]

How are you coding the constraint?

Can you fix the measurement errors to be zero, and then add a new latent variable, with variance 1? (Or is this what you are doing?)

Jeremy

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