[R] separation occuring in clustered data

[Yue]

 hi all,

Prior to this post I asked a question how to deal with binary clustered data
when the crosstab by variables shows an empty cell. I figured out later that
such an empty cell corresponds to what is called "separation". Fortunately,
R package "logistf" is developed to handle such a problem using a
penalised-likelihood method.  However, it seems that logistf is only
suitable when observations are completely independent, thus will be
problematic if used on my clustered data. I was wondering if anyone had
similar experience and has any suggestion for this? Thanks very much!

Yue

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