[EpiData-list] Re: EpiData-list Digest, Vol 57, Issue 14

epidata-list at lists.umanitoba.ca epidata-list at lists.umanitoba.ca
Fri Jul 18 15:47:08 CDT 2008


Dear Pedro,
Thank you for your kind and the great insights!
I guess I am thinking of visit number as control variable to know
number of visits per patient which of course I could do it later on.
So I guess it was just matter of "can't wait until time of analysis to
know the answer per patient". I better hold down my horses until
analysis time then!  :-)

Best regards
ziad


On Fri, Jul 18, 2008 at 10:04 AM,
<epidata-list-request at lists.umanitoba.ca> wrote:
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>   1. Visit number (epidata-list at lists.umanitoba.ca)
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> ---------- Forwarded message ----------
> From: epidata-list at lists.umanitoba.ca
> To: epidata-list at lists.umanitoba.ca
> Date: Fri, 18 Jul 2008 09:47:07 -0300
> Subject: [EpiData-list] Visit number
> Dear Ziad,
>
> Of course a visit number is interresting... if you want visualize your data
> and order it by visit number. Having a visit number at your paper forms is
> also interresting for the very same reason.
>
> However, most analysis softwares such as R and Stata do not bother with the
> visit number while running survival analysis - which I guess you will do
> later. :)  For survival analysis the most important data is the date of the
> evaluation, somehting indicatig what happened at the period, and a date
> indicating the beggining of the period. Most softwares have available
> analysis whith time dpending variables - which has a dataset wiht a
> structure containing the same patient at several lines - each line a
> different period. Of course to do that, there must a unique idenfier for
> each patient which will be repeated all the lines where the same patient
> appear.
>
> Again, visit number is important but not that importatn. As a previous
> answered, if you already started your job and you have a lot of data in your
> dataset it will be easier to insert a variable indicating visit number.
> Otherwise, you could update you qes file with a nwe variable indicating
> visit number.
>
> Best regards,
> Pedro Emmanuel
>
>
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-- 
Ziad El-Khatib
AIDS Unit
National Institute for Communicable Diseases (NICD)
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Division of International Health (IHCAR)
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