Your -forvalues- loop must extend from integer
to integer.
forval i=2/4 {
local im1=`i'-1
gen diff`im1'=mes`i'-mes1
}
should work. If any -mes`i'- has missing
values then the result will be missing too.
Nick
[email protected]
[email protected]
> I have a date set with 1 line per patient, and many measures
> by patient
> (mes1, mes2, mes3, ...). The number of measurement is given
> by the nb_mes
> variable.
>
> id mes1 mes2 mes3 mes4 nb_mes
> 1 30 21 25 46 4
> 2 26 24 2
> 3 14 15 13 3
>
>
> For each patient, I would like to calculate the difference :
> mes2-mes1, mes3-mes, ..., until : mes`nb_mes'-mes1
>
> I've tried this:
>
> forvalues i=2/`nb_dos' {
> local im1=`i'-1
> gen diff`im1'=mes`i'-mes1
> }
>
> Invalid syntax
>
> The problem comes from forvalues i=2/`nb_dos'
>
> `nb_dos' is not the good syntax
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
