Hi,
I am using a data called Rail in the nlme package. The data contains two
variables: Rail and Travel.
>Rail
Grouped Data: travel ~ 1 | Rail
Rail travel
1 1 55
2 1 53
3 1 54
4 2 26
5 2 37
6 2 32
7 3 78
8 3 91
9 3 85
10 4 92
11 4 100
12 4 96
13 5 49
14 5 51
15 5 50
16 6 80
17 6 85
18 6 83
>Rail$Rail
>[1] 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5 6 6 6
>Levels: 2 < 5 < 1 < 6 < 3 < 4
Then I used the contrasts function as:
>contrasts(Rail$Rail)
And it returns with some strange continuous values:
.L .Q .C ^4 ^5
[1,] -0.5976143 0.5455447 -0.3726780 0.1889822 -0.06299408
[2,] -0.3585686 -0.1091089 0.5217492 -0.5669467 0.31497039
[3,] -0.1195229 -0.4364358 0.2981424 0.3779645 -0.62994079
[4,] 0.1195229 -0.4364358 -0.2981424 0.3779645 0.62994079
[5,] 0.3585686 -0.1091089 -0.5217492 -0.5669467 -0.31497039
[6,] 0.5976143 0.5455447 0.3726780 0.1889822 0.06299408
I am expecting to see 0s and 1s in the contrast, but it may be due to the
order of the factor levels for Rail variable?
Best,
Jing
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