Faye,
This sequence of commands does the trick. The obnsno
variable enables to return to the original sort order;
-gsort- sorted in reverse order so that each run
starts with the highest value of newvar, i.e. the
number of observations in that run.
clear
input binvar
1
1
1
0
0
1
1
1
1
0
end
gen obsno=_n
gen newvar=1
replace newvar=newvar[_n-1]+1 if binvar==binvar[_n-1]
gsort -obsno
replace newvar=newvar[_n-1] if binvar==binvar[_n-1]
replace newvar=. if binvar==0
sort obsno
list
No doubt this could be done with fewer commands.
Svend
________________________________________________________
Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6
DK-8000 Aarhus C, Denmark
Phone, work: +45 8942 6090
Phone, home: +45 8693 7796
Fax: +45 8613 1580
E-mail: [email protected]
_________________________________________________________
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