st: xcollapse, multiple ifs

[richard boylan <richardtb25@gmail.com>]

Is there any way to have different "if statements" with the command xcollapse?

I tried to do

xcollapse (mean) m1 = x if year > 1970 & year <1980 (mean) m2 = x if
year > 1980 & year < 1990...

but I got an error message.

One way to get around this problem is to just define new variables so

x1 = x if  year > 1970 & year < 1980
x2 = x if  year > 1980 & year < 1990

and then

xcollapse (mean) x1 x2...

but was wondering if there was a better way of doing this.

Thank you.

Richard
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