st: Dropping Observations

[momo <mmsabra@gmail.com>]

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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