I have been trying to do tukey's test to no avail. This is what I have
and the error produced:
pen.df = data.frame(blend, treatment, y)
source("tukey.1.r")
tukey.1(aov.pen, pen.df)
Error in tukey.1(aov.pen, pen.df) : the model must be two-way
This is a two-way design. Therefore I am confused. Can anyone help?
Raphael
> pen.df
blend treatment y
1 1 A 89
2 2 A 84
3 3 A 81
4 4 A 87
5 5 A 79
6 1 B 88
7 2 B 77
8 3 B 87
9 4 B 92
10 5 B 81
11 1 C 97
12 2 C 92
13 3 C 87
14 4 C 89
15 5 C 80
16 1 D 94
17 2 D 79
18 3 D 85
19 4 D 84
20 5 D 88
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