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Re: st: "covariates in dataset 2 do not match covariates in dataset1"

From   Michelle L Stransky <>
To, Maarten buis <>
Subject   Re: st: "covariates in dataset 2 do not match covariates in dataset1"
Date   Tue, 16 Mar 2010 09:37:07 -0400

Yes, I do have a _mj and _mi. Could these be getting 'lost' between regression commands?



* Maarten buis <> [Tue 16 Mar 2010 04:05:22 AM EDT]:

--- On Mon, 15/3/10, Michelle L Stransky wrote:
I'm working with a multiply imputed dataset (so I have 5
poverty variables to account for missing values).  I
used the -reshape long- command to make each imputed
variable it's own case (so now, for each case, I have it
listed 5 times each with 1 imputation of income).

I'm running a series of regressions, trying to fine tune
the predictor variables.  The first regression runs
fine but subsequent regressions (whether I use my .do file
or copy & paste them into the command window) will not
calculate.  I receive an error message stating that
"covariates in dataset 2 do not match covariates in

I checked the file and everything seemed fine; the only
things that don't exactly match across imputations of the
dataset are the poverty values.  In fact, I've used
this exact procedure on 2 other (very similar) datasets with
no problems.  It's only been in the last month that I
receive this message.

What doesn't make sense to me is that the first regression
command runs perfectly fine but subsequent commands do not
(they're all in exactly the same form-- mim: svy: logistic
dv iv1 iv2 iv3).  And if I close Stata and then open it
and run the second regression it works.  I've attempted
to run this analysis on Stata9 Intercooled and Stata11
SE.  It doesn't seem to matter; I receive the same

Do you have any recommendations or suggestions for me as to
why this happens and/or how to fix it?

-mim- is looking for a variable _mj to identify the different
datasets and _mi to identify the observations. Do these exist
in your dataset?

-- Maarten

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen

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