Hi,
I am create a new DF that summarizes the mean angle per treatment/trial, of
the original DF (see below). I have had some success using:
(tapply(df$Angle, INDEX=interaction(df$State,
df$Trial), FUN=mean)); however, this gives the answer as a list, which
means I would have to split the name to get the categories back. Does
anyone know a simple way to transform the Original DF into Summary DF?
Thanks in advance,
James
Original DF
> df
Angle Trial Treatment
1 43.1297 1 C
2 62.3613 1 C
3 88.2767 2 C
4 75.2431 2 C
5 91.3668 3 C
6 61.2800 3 C
7 55.5575 1 U
8 69.4661 1 U
9 67.5512 2 U
10 95.5528 2 U
11 75.8689 3 U
12 66.9070 3 U
Summary DF
> sdf
Angle Trial Treatment
1 52.7455 1 C
2 ... 2 C
3 ... 3 C
4 ... 1 U
5 ... 2 U
6 ... 3 U
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