choices | R Documentation |
Convert a set of rankings to a list of choices, alternatives, and rankings. The choices and the corresponding alternatives make up the exchangeable part of the Plackett-Luce with ties.
choices(rankings, names = FALSE)
rankings |
a |
names |
logical: if |
A data frame of class "choices"
with elements:
choices |
A list where each element represents the set of items chosen for a single rank in the ranking. |
alternatives |
A list where each element represents the set of items to choose from for a single rank in the ranking. |
ranking |
A list where each element represents the ranking that the choice belongs to. |
The list stores the number of choices and the names of the objects as the
attributes "nchoices"
and "objects"
respectively.
R <- matrix(c(1, 2, 0, 0,
4, 1, 2, 3,
2, 1, 1, 1,
1, 2, 3, 0,
2, 1, 1, 0,
1, 0, 3, 2), nrow = 6, byrow = TRUE)
colnames(R) <- c("apple", "banana", "orange", "pear")
actual_choices <- choices(R, names = TRUE)
actual_choices[1:6,]
coded_choices <- choices(R, names = FALSE)
coded_choices[1:2,]
as.data.frame(coded_choices)[1:2,]
attr(coded_choices, "objects")
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