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Re: st: Issue with multiple imputation -ICE-


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Issue with multiple imputation -ICE-
Date   Wed, 13 Feb 2008 13:26:06 +0000 (GMT)

--- René Wevers <rene@ricardis.tudelft.nl> wrote:
> For instance I am estimating missing variables for the full time
> equivalent (FTE) of employees of a company mainly based on the
> absolute number of employees. (Logically) the absolute number of
> employees is never below zero. Also when I run a regression between
> the FTE number and absolute number I get a highly significant 
> relation with positive coefficient and a positive constant estimates.
> Nevertheless when I run -ice-, the imputed values are extremely often
> (far) below zero (!!!).

Such a pattern can occur when the absolute number of employees have
received the value 0 when it actually should have been missing: than
you are extrapolating the number of FTEs for a company with 0
employees, which could very well be negative. 

Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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