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Re: st: RE: st: correction of some data by age group and for years:

From   Maarten buis <[email protected]>
To   [email protected]
Subject   Re: st: RE: st: correction of some data by age group and for years:
Date   Mon, 4 Aug 2008 19:24:25 +0100 (BST)

--- carmen gamarra <[email protected]> wrote:
> My problem is not missing data specifically. Within countries poorly
> many deaths from cancer of the uterine cervix and uterine corpus are
> inadequately coded as �uterine cancer not otherwise specified� 
> Please note: We know that cases coded as "unspecified" belong to
> uterine cancer, and we need redistribute proportionately all these
> cases by allocating the deaths to either uterine cervix or uterine
> corpus cancer according to the age-specific proportions specified as
> uterine cervix and uterine corpus cancer in each year of study
> according to recommendations Pan American Health Organization (PAHO).
> The PAHO recommendations are that all cases of cancer of the uterus
> unspecified be redistributed and I need to know which would command
> in STATA order to perform these distributions.
> Age group: 20-29, 30-39, 40-49, 50-59, 60-69, 70-79, 80 and over
> Three type of uterine cancer ("unspecified" uterine cancer, and
> uterine cervix and uterine corpus cancer)
> 3 years of study (2004, 2005 and 2006). 

This is still a missing data problem: you want to use information that
is not recorded. Information that is not recorded is missing. The fact
that the observations weren't given a missing value, does not mean that
this is not a missing data problem. 

What the PAHO is proposing could be turned into a sensible multiple
imputation model, but this is very tricky business and you should not
attempt to do that until you have carefully studied the references I
have given you.

-- 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

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