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Re: st: imputation of missing dates

From   roland andersson <>
Subject   Re: st: imputation of missing dates
Date   Sat, 7 May 2011 15:22:44 +0200


I wonder why you need to define a date when the invited participant
did not turn up? What will you do with this date? If you really need
this date I wonder if you have the date when the invitation was sent?
If you have I would propose that you define the number of days after
the invitation that the examination took place (for the responders)
and impute this number for the non-responders.


Roland Andersson

2011/5/5 Yulia Blomstedt <>:
> Dear Statalist,
> I need to impute the missing data in a dataset by matching it to the
> already existing data. I have never worked with either imputation or
> matching and am at a loss. I would deeply appreciate any advice.
> My dataset contains background data for individuals who participated
> in a medical examination (i.e., “participants”) and who did not
> participate in the examination (“non-participants”) between 1990-2006.
> All individuals were invited to participate in the examination when
> they reached a certain age. The examination usually took place during
> the same year as they reached that age between mid-January and  the
> end of June or between August and mid-December.
> I have the following data: the year (yyyy) when the individuals were
> invited to participate in the examination (YEAR) and the exact date
> (yyyymmdd) when the “participants” have participated in the
> examination (EXAMDATE).
> I need to create an EXAMDATE for “non-participants”, the date when
> they could have participated in the examination. How do I do it?
> The EXAMDATE of “non-participants” should have the same
> range/distribution as among the “participants”, i.e., it should be
> between mid-January and the end of June or between August and
> mid-December during the year when a “non-participant” was invited to
> the examination.
> Thank you in advance for your help.
> Yulia
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