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# salad data --------------------------------------------------------------
if (require("prefmod")) {
## analysis of salad data from Critchlow, D. E. & Fligner, M. A. (1991).
## salad is a data.frame of rankings for items A B C D
## 1 = most tart, 4 = least tart
data("salad", package = "prefmod", envir = environment())
## convert to rankings object
salad_rankings <- as.rankings(salad)
## create data frame of corresponding features
## (acetic and gluconic acid concentrations in salad dressings)
features <- data.frame(salad = LETTERS[1:4],
acetic = c(0.5, 0.5, 1, 0),
gluconic = c(0, 10, 0, 10))
## convert rankings to long-form (explode rankings)
salad_long_rankings <-
data.frame(features[t(col(salad)),],
ranking = c(t(salad)),
chid = c(t(row(salad))))
## salad pairs (treat 3rd and 4th as unranked)
salad_pairs <- as.matrix(salad)
salad_pairs[salad_pairs %in% c(3, 4)] <- 0
salad_pairs <- as.rankings(salad_pairs)
}
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