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Re: st: imputation of missing dates

From   roland andersson <>
Subject   Re: st: imputation of missing dates
Date   Tue, 10 May 2011 18:12:45 +0200


I wonder if you made any specific intervention at the examination and
want to see the effect of this intervention on survival. Otherwise you
may consider using attained age as analysis time for the survival
analysis, as there is no exact point in time when the persons came
under risk or change in risk. In that case you do not need an exact
date for the start of the analysis.

See some of the references below (I can give you more exact refernce
if you contact me directly.

Stocks 2010 on prostate cancer
Qiao 2009 on metabolic syndrome and stroke
Luo 2008 on pancreas cancer
Lamarca 1998 attained age survival analysis
Cheung 2003 survival analysis attained age

Roland Andersson

2011/5/9 Yulia Blomstedt <>:
> 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
> birth.
> 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.
> Sincerely,
> Yulia
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