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Re: st: FW: Imputation Commands ?


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: FW: Imputation Commands ?
Date   Tue, 29 Apr 2008 17:20:25 +0100 (BST)

--- "Daniel Sepulveda-Adams" wrote:
> I'm having trouble finding the proper command to impute values in a
> given row of data. Hoping someone could direct me appropriately.
>
> Consider a row of data as follows
>
>          obs  x1  x2  x3   x4  x5
>          --   --  --  --   --  -- 
>          1     2   4   .    5   1
>          2     .   4   1    3   0
>          3     1    .   .   .   1
>
> What I want to do is to fill-in the missing values as a function of 
> the surrounding row/variable values. I presume I want to average a
> given missing-value's surrounding +-3 values and impute accordingly.

Imputing values with a mean is generally not a good idea, a discussion
as to why can be found here:

http://www.stata.com/statalist/archive/2007-12/msg00504.html

In this post you can also find that one alternative is -ice- by Patrick
Royston. You can read more about this in the following Stata Journal
aricles (which you can get from 
http://www.stata-journal.com/archives.html )

Royston, P. 2004. Multiple imputation of missing values. Stata Journal
4(3): 227241.

Royston, P. 2005. Multiple imputation of missing values: update. Stata
Journal 5(2): 188201.

Royston, P. 2005. Multiple imputation of missing values: Update of ice.
Stata Journal 5(4): 527-536. 

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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