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R: st: imputation of missing dates

From   "Carlo Lazzaro" <>
To   <>
Subject   R: st: imputation of missing dates
Date   Mon, 9 May 2011 15:05:01 +0200

Dear Yulia,
if the aim of your research is a survival analysis, cant'you consider
including a dummy yes/no for examination (instead of EXAMDATE) among the
other covariates in a parametric or semiparametric regression model? 

Kindest Regards,
-----Messaggio originale-----
[] Per conto di Yulia Blomstedt
Inviato: lunedì 9 maggio 2011 13.51
Oggetto: Re: st: imputation of missing dates

Dear Marteen and Carlo, thank you for the valuable advise!

Dear Roland, thank you for your input. Unfortunately, we do not know
the exact date of the invitation (only the year). One could have
calculated it from the date of birth, but we know only the year of
We need EXAMDATE for non-participants in order to conduct a survival
analysis (we know the exact date of death).
My first choice was to calculate the survival from the YEAR when
indviduals were invited to participate in the examination. Since, this
would result in an inprecise person-time, I tried to explore the
possiblity of creating an exact EXAMDATE. After all the received
advice, this, however, does not seem as a very good alternative.

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