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> From: de...@exeter.ac.uk
> To: r-help@r-project.org
> Date: Wed, 20 Apr 2011 12:41:29 +0100
> Subject: [R] Extrapolating data points for individuals who lack them
>
> Hi,
>
> We have an experiment where individuals responses were measured over 5 days.
> Some responses were not obtained because we only allowed individuals to
> respond within a limited time-frame. These individuals are given the maximum
> response time as they did not respond, yet we feel they may have done if
> given time (and by looking at the rest of their responses over time, the
> non-response days stand out).
>
> We therefore want to extrapolate data points for individuals, on days when
> they didn't respond, using a regression of days when they did.
>
> Does anyone know how we could do this quickly and easily in R?
You are probably talking about right censoring. See things like this,
( you may have good luck just with "R" rather than "CRAN" )
http://www.google.com/#sclient=psy&hl=en&source=hp&q=CRAN+informative+%22right+censoring%22
If you post data maybe someone can try a few things. It isn't hard to take data
subsets, fit models, and replace data with model predictions but easier and more
interesting to illustrate with your data.
Personally I would avoid making up data and of course extrapolation tends
to be the most error prone way of doing that.
>
> Thanks very much
> Dave
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