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exprep
2007 Mar 07
5
how to "apply" functions to unbalanced data in long format by factors......cant get "by" or "aggregate" to work
...6 variables:
$ ID : num 7 7 7 7 7 7 8 8 8 8 ...
$ time : Factor w/ 2 levels "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 eac...