Dear all,
I am trying to fit mixed effect model for nested repeated measurement data in R using lme with composite convariance structures A@B such as: Unstructured with Autoregressive UN@AR(1) [ kronecker product].
The following is the nested repeated measurement model:
nested.lme=lme(Y~Time,data=df, random=~Time|Visit/ID, na.action=na.exclude, method='ML') How can I fit the previous model with
kronecker product in lme ?
Thank you in advance for your cooperation.
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Enas Ghulam
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