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2007 Mar 07
5
how to "apply" functions to unbalanced data in long format by factors......cant get "by" or "aggregate" to work
...evels "120hr","24hr": 1 1 1 1 2 2 2 1 1 1 ... $ treatment: Factor w/ 2 levels "control","trt": 1 1 1 2 2 1 1 2 1 1 ... $ expREP : Factor w/ 3 levels "expREP1","expREP2",..: 1 1 1 3 1 1 1 1 2 2 ... $ techREP : Factor w/ 3 levels "techREP1","techREP2",..: 3 2 1 1 1 3 1 3 3 2 ... $ Y : num 14.4 14.1 14.2 13.8 14.1 ... Could someone please help with doing something like the following 1. I would like to find the median for each unique combination of factors using the data in the long format (like finding...