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st: mlogit with empty cell

From   "stata_user stata_user" <>
Subject   st: mlogit with empty cell
Date   Fri, 25 Aug 2006 10:30:01 +0100

I consider the follwoing model ,

xi: mlogit y i.x1 i.x2 x3, baseoutcome(1) rrr

with y is a discrete varaible with 4 categories,
x1 dichotomious ,
x2 discrete varaible with 4 categories
and x3 is continnuous

the cross tab of y and x2 gives one empty cell

How I can fit the model by taking into account the "empty cell"?

Thanks a lot for any help


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