[R] Plotting Question

[Frank E Harrell Jr]

You might investigate the event.chart function in the Hmisc library (see http://hesweb1.med.virginia.edu/biostat/s/Hmisc.html)

On Thu, 16 Jan 2003 08:10:34 -0800
"Coate, Bruce" <bruce.coate at pfizer.com> wrote:

> For a clinical trial I am involved with, I would like a plot (for each
> subject) similar to the following which will indicate what drugs that
> subject was taking on each day during the study:
> 
> Drug 1    [---]           [----------------------]
> 
> Drug 2    [-------------------------------------]
> 
> Drug 3           [---------]  [----------------------------]
>              |--------------------------------------------------|
>              0                                                n
> 
>                            Study Day
> 
>  I have thought about using strip plot, perhaps setting a flag each day the
> subject is on study (1 if drug x is taken on that day, NA otherwise). But
> that means I would have to create extra records for each subject because my
> data looks something like,
> 
> Subject   Drug   Start          Stop
> ------------------------------------------
>  1           1         5Jan2002   10Jan2002
>  1           1        12Jan2002  30Jan2002
>  2           2        15Feb2002  20Mar2002
> etc.
> 
> Does anyone have a suggestion as to which kind of plotting function is best
> suited to this? 
> Thanks.
> 
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-- 
Frank E Harrell Jr              Prof. of Biostatistics & Statistics
Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences
U. Virginia School of Medicine  http://hesweb1.med.virginia.edu/biostat