Ziad,
If your variables are visits, create a set of dummy variables which
are ones for each visit (with -foreach v of varlist- cycle) and add
them all up with -egen totvis=rowtotal()- function. The variable
totvis will be the number of visits.
Vladimir.
2008/3/8, Ziad El-Khatib <[email protected]>:
> 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 <[email protected]> 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: [email protected]
> > [mailto:[email protected]] Per conto di Ziad El-Khatib
> > Inviato: sabato 8 marzo 2008 6.21
> > A: [email protected]
> > 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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> >
> >
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> >
> *
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--
__________________
Volodymyr Vakhitov
[email protected]
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