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, the mean "full
treatment" value, and the mean "partial treatment" value.
Is there an easy way to do this?
(Also, for each experiment_id, I then want to find
1) "mean full treatment value" - "mean control value"
2) "mean partial treatment value" - "mean control value".)
Thanks!
--
View this message in context:
http://www.nabble.com/help-with-two-layers-of-factors-tp22851129p22851129.html
Sent from the R help mailing list archive at Nabble.com.
______________________________________________
[email protected] mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
