1. 2008-05-02 Re: [R] Aggregate() questions r-help Henrique Dallazuan 2. 2008-05-01 Re: [R] Aggregate() questions r-help Chip Barnaby 3. 2008-04-30 Re: [R] Aggregate() questions r-help Henrique Dallazuan 4. 2008-04-30 [R] Aggregate() questions r-help Chip Barnaby