Michele,
You want to put a tag on duplicate observations (in my field we don't call this a dummy). It can be done with the -duplicates tag- command; try to copy and run the commands below.
Svend
--------------------------------------------
clear
input men str1 fund date
1 A 20040630
1 A 20040730
1 A 20040830
1 B 20040830
1 B 20040930
2 C 20040630
2 D 20040630
2 D 20040730
3 C 20040630
3 C 20040730
3 C 20040830
3 C 20040930
3 D 20040930
end
format date %9.0f
duplicates tag men date , gen(dup)
list
--------------------------------------------
________________________________________________________
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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