st: R: Dropping Observations

[Cardani Roberta <roberta.cardani@unicatt.it>]

drop var11 if (var11==var5)
you need = =

________________________________________
Da: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] per conto di momo [mmsabra@gmail.com]
Inviato: martedì 9 novembre 2010 17.58
A: statalist@hsphsun2.harvard.edu
Oggetto: st: Dropping Observations

Dear Colleagues

I have a dataset with the following shape:

var1.......var5......var10(which sum obs in var11)... var11
co. N......1203.........................3........ ........................
.................................................. .....................1450
..................................................
......................1203
..................................................
......................1620
co.N......etc

so, I need to drop the observations in var11 which equal the unique value in
var5. in the example above I want to drop the observations in var11=1203
that =1203 in var5 for each var1(company).

I tries
drop var11 if (var11=var5) but doesn't work and gives me, var11=var5 invalid
name
or type mismatch if I put ==

in addition how can I change the value of var10 to be 2 in the example above
instead of 3 after dropping the observation that =1203 in var11. I.e to
change the summation of var11, which var10=number of observations in var11.

Thanks in advanced

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