I have the following dataset and need to split it into separate files based on DATE and ID. I need to use a combination of the two variables as the file names, for example, "JAN2001_1.CSV". I do not know ex ante how many groups there are. Any help would be greatly appreciated! DATE ID VAR1 VAR2 VAR3 JAN2001 1 ... ... ... JAN2001 2 ... ... ... JAN2002 1 ... ... ... JAN2002 2 ... ... ...
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