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treament_type
2009 Apr 02
1
help with two layers of factors
I have a data frame that looks something like...
Column 1 is an experiment_id, Column 2 is the type of treatment ("control",
"full treatment", or "partial treatment"), and Column 3 is a value.
Experiment_id Treament_type Value
12345 "control" 3
12345 "full treatment" 4
12345 "full treatment" 5
12345 "partial treatment" 4
10000 "control" 1
What I want to do is this:
For each experiment_id, compute the mean "control" value, th...