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Re: st: R: Patients missing visits


From   "Ziad El-Khatib" <Ziad.El-Khatib@ki.se>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: R: Patients missing visits
Date   Sat, 8 Mar 2008 07:29:55 -0800

Hi again,
i could not manage to implement the code below in my dataset because i
don't know how many patients out of how many didn't come, any tips
about more generic code?

Thank you in advance and best regards
ziad


On Sat, Mar 8, 2008 at 1:46 AM, Carlo Lazzaro <carlo.lazzaro@tin.it> wrote:
> Dear Ziad,
>  please take a look at what follows below (assuming: 10 patients=id; one
>  visit=first_visit):
>  ------------------------------begin example---------------------------
>  set obs 10
>  obs was 0, now 10
>
>  . g id=_n
>
>  . g first_visit=1 in 1/5
>  (5 missing values generated)
>
>  . replace  first_visit=0 in 6/10
>  (5 real changes made)
>
>  . count  if  first_visit==0 & id!=.
>     5
>
>  . list  if  first_visit==0 & id!=.
>
>      +---------------+
>      | id   first_~t |
>      |---------------|
>   6. |  6          0 |
>   7. |  7          0 |
>   8. |  8          0 |
>   9. |  9          0 |
>   10. | 10          0 |
>      +---------------+
>  --------------------------------------end
>  example---------------------------HTH and Kind Regards,
>
>  Carlo
>
>  -----Messaggio originale-----
>  Da: owner-statalist@hsphsun2.harvard.edu
>  [mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Ziad El-Khatib
>  Inviato: sabato 8 marzo 2008 6.21
>  A: statalist@hsphsun2.harvard.edu
>  Oggetto: st: Patients missing visits
>
>  Dear STATA lister,
>  I am following cohort of patients over different time points (variable
>  = visit). I am looking at couple of indicators, for example vl and
>  weight at every visit.
>  I want to find
>  1) the number of patients who didn't come to every visit?
>  2) and to find which patients didn't come?
>
>  Any tips how to do it?
>
>  Thank you in advance and best regards
>  ziad
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