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How to use grpstats to create statistics using nominal variable from a dataset?

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Robert
Robert 2018-2-27
Hello,
Wondering how to use grpstats to create statistics using nominal variable from a dataset?
This is my dataset (example...)
1 2 3 4 5 6
Year Month Day Season AA BB
1 2002 1 1 Winter 10 2.5
2 2002 4 22 Spring 8 5
3 2002 5 13 Spring 6 3
4 2002 7 4 Summer 2 2.7
5 2002 8 25 Summer 1 11
6 2002 10 16 Fall 13 0.5
7 2002 11 27 Fall 0.1 4.2
...
1000 2007 2 1 Winter 10 2.5
1001 2007 4 22 Spring 8 5
1002 2007 6 13 Spring 6 3
1003 2007 7 4 Summer 2 2.7
1004 2007 9 25 Summer 1 11
1005 2007 11 16 Fall 13 0.5
1006 2007 12 27 Fall 0.1 4.2
...
I would like to calculate statistics as derived from grpstats by using variable 'Month' and/or 'Season'. In this case Months 1,2 and 3= Winter; 4, 5 and 6=Spring; 7, 8 and 9=Summer; and 10, 11 and 12= Fall).
Thank you for your suggestions!

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