st: RE: R: Dropping Observations

[Nick Cox <n.j.cox@durham.ac.uk>]

Although Momo's precise problem is not at all clear to me it was stated here that == doesn't work in the sense that "type mismatch" is the error message. 

The issue is presumably that one variable is string and the other numeric. Perhaps applying -destring- to the string variable with numeric content is the easiest thing to do first. 

Nick 
n.j.cox@durham.ac.uk 

Cardani Roberta

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

momo

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.


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