Re: st: condition on imputed data with multiple imputation

[Stas Kolenikov <skolenik@gmail.com>]

You can probably impute the time of intake relative to delivery, which
is a negative variable. Flip the sign to make it positive, take logs,
and you can impute that with -regress-. Then you can produce a passive
intake variable out of it. I know that's convoluted, but that might be
the easiest way to go.

If you persuade Patrick Royston, he might be able to add support of
-glm- command, along with the other supported ones. For your case, a
gamma family with log link might seem like a reasonable option. If you
are really adventurous, you can try to hack the -ice- code to find
where an extra command might go, and add it there.

On Tue, Jan 18, 2011 at 12:59 PM, bichtram huynh <bichtrambe@hotmail.com> wrote:
> hello everyone,
>
> i'd like to know if it is possible to put limits on imputed data using MICE (ice)?
>
> i want to study the influence of the timing of a medication intake during
> pregnancy on a birth outcome (for example:birth weight)
> i have some missing values on the date of the medication intake during pregnancy.
> So i want to impute  them.
>
> My problem is some women deliver at 36 weeks of gestation, others deliver at 41 weeks...
> And by imputing data, sometimes i have an imputed data on medication intake
> at 38 weeks whereas the woman has delivered at 36 weeks.
>
> My question is: is it possible to put a condition so the imputed date of medication intake<term of delivery.
> thanks for your help,
> Flo
>
>
>
>
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-- 
Stas Kolenikov, also found at http://stas.kolenikov.name
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