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Re: st: how to fill some gross wage missings if I have the net wage

From   Maarten buis <>
Subject   Re: st: how to fill some gross wage missings if I have the net wage
Date   Thu, 16 Dec 2010 10:54:56 +0000 (GMT)

--- On Thu, 16/12/10, Laura R. wrote:
> I came up with the following solution: just make a
> regression on gross wage with several independent
> variables with the cases that report gross wage, and
> then calculate the gross wage for the others using the
> b coefficients and the independent variables. Would that
> work as well?

No, if you want to do imputation you'll have to do it 
right, i.e. do multiple imputation. What you propose would
put all imputed observations on the regression line, i.e.
you would overestimate the correlations and all subsequent
statistics that depend on them. Moreover you are treating
your imputations as real observations rather than results
from a model. To do this right you must also take the 
imputation model uncertainty into account. 

In Stata 11.1 you can use panel data (-xt-) models with 
-mi estimate-, so the presence of panel data is not a 
reason to forgo multiple imputation.

Hope this helps,

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


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