st: data manipulation

[jdubas@nd.edu]

Hello, 
I have what may be a basic question.  I have data like this:
country year series1 series2 series3
1          1      1000     .         .
1          2      1035     .         .
1         1        .        50        .
1          2       .         53       .
1         1        .          .        7 
1         2        .          .         8.5
2 etc


Is there anyway I can basically collapse these so that:
country  year  series1   series2  series3
1           1      1000       50        7
1           2      1035       53        8.5

for a number of countries?

Thanks for your help.
Justin


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