Example: From 'The R Book' 2nd ed. ~ 2.3.2 Generating Factor Levels...
[1] "# From 'The R Book' 2nd ed. ~ 2.3.2 Generating factor levels..."
Temp Soft M.user Brand
1 Low Hard N X
2 Low Hard N M
3 High Hard N X
4 High Hard N M
5 Low Hard Y X
6 Low Hard Y M
7 High Hard Y X
8 High Hard Y M
9 Low Medium N X
10 Low Medium N M
11 High Medium N X
12 High Medium N M
13 Low Medium Y X
14 Low Medium Y M
15 High Medium Y X
16 High Medium Y M
17 Low Soft N X
18 Low Soft N M
19 High Soft N X
20 High Soft N M
21 Low Soft Y X
22 Low Soft Y M
23 High Soft Y X
24 High Soft Y M
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