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Re: st: outoput from prvalue following zinb
From
Richard Williams <[email protected]>
To
[email protected], "[email protected]" <[email protected]>
Subject
Re: st: outoput from prvalue following zinb
Date
Thu, 22 Aug 2013 09:47:27 -0500
There are multiple versions of prvalue floating around. (Note that
you should say where user-written commands come from; unlike most
commands, things written by Long that are on SSC are likely to NOT be
the most current versions, as Long maintains the latest versions on
his own site.) Do -findit spost9- if you haven't already. If you
still have problems then a replicable example or at least the syntax
and output from your current commands would help.
At 06:48 AM 8/22/2013, Fotland, Knut Erik wrote:
I am running a zero-inflated negative binomial regression model on a
dataset of 720 observations, in an attempt to determine how
socio-economic factors and popular support affect violent events in
a country. The dependent variable is a count variable for events per
month. The independent variables are a mix of dummy-coded, ordinal
and interval variables.
My problem is that, after running predicted values (prvalue-command)
I get no numbers for the probabilities, the Pr(Always 0|z)-value
shows zero, but the other Pr(y i) is missing. Having thought this
may be due to my settings for the chosen variables were incompatible
with the sample range I changed them to relatively moderate values.
That did not alter the result, and I got the same missing
phenomenon. Then I tried having only one variable differ in the two
models. The command I ran were: "prvalue, x(var1=0) rest(mean)
diff", but I got the same missing phenomenon again.
I would greatly appreciate some input on what I am doing wrong.
Knut Erik
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-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME: (574)289-5227
EMAIL: [email protected]
WWW: http://www.nd.edu/~rwilliam
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* http://www.ats.ucla.edu/stat/stata/