Finding -xi3-: was st: Logistic Interaction Effect

[Steven Samuels <ssamuels@albany.edu>]

Marten mentioned the -xi3- command for creating extended interaction  
terms.  "findit xi3" did not find the command for me.  Neither did  
"search xi3, all."   However it is there on SSC and  "ssc describe  
xi3" and "ssc install xi3" work.

In the past I've used the -desmat- command by John Hendrickx to  
create extended interaction effects.

Steven
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