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st: asclogit collinear problem


From   Firat Yaman <firat80@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: asclogit collinear problem
Date   Fri, 19 Feb 2010 11:05:00 +0100

I am estimating a regional choice model. I have 5500 cases and 104 regions,
but keep only 50 (including the chosen alternative) of them randomly because
of memory. When I run asclogit with immigrant concentration as the only
covariate, the command works fine. As soon as I add another alternative
specific variable (such as population, average house prices etc) I get a
warning "model has collinear variables, convergence may not be achieved".
Indeed, the loglikelihood function appears to be non-concave. Note that I am
not using any variables in casevars(), and that McFadden proves the
concavity of the LL function.
Can anyone help me out??

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