how to subset unique factor combinations from a data frame.

Tue, Jan 4, 2011 5:07 AM

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Krishna Kumar how to subset unique factor combinations from a data frame. Jan 3 PIKAL Petr Odp: how to subset unique factor combinations from a data frame. Jan 4 Krishna Kumar how to subset unique factor combinations from a data frame. Jan 4 PIKAL Petr how to subset unique factor combinations from a data frame. Jan 4 Dennis Murphy how to subset unique factor combinations from a data frame. Jan 4 Krishna Kumar how to subset unique factor combinations from a data frame. Jan 4 PIKAL Petr how to subset unique factor combinations from a data frame. Jan 5