wdbm | R Documentation |
Weighted Distance-based Models for ranking data. The distance-based models assume that rankings closer to the modal ranking are more likely to be observed. Weighted distance-based models are extensions of distance-based models with by allowing weights for different items.
wdbm(dset, dtype="tau")
dset |
a ranking dataset (aggregated) |
dtype |
type of weighted distance between two rankings. tau : Kendall's tau, rho : Spearman's rho, rho2 : Spearman's rho square, foot : footrule |
Fit the weighted distance-based models for the dataset and return a mle object. Standard methods on mle (e.g., @coef, @vcov) apply. The modal ranking and the Chi-square residual are given in the output.
Paul H. Lee and Philip L. H. Yu
Lee, P. H., and Yu, P. L. H. (2010) Distance-based tree models for ranking data. Computational Statistics and Data Analysis, 54(6), 1672-1682.
Lee, P. H., and Yu, P. L. H. (2012) Mixtures of weighted distance-based models for ranking data with applications in political studies. Computational Statistics and Data Analysis, 56(8), 2486-2500.
dbm
## create an artificial dataset X1 <- c(1,1,2,2,3,3) X2 <- c(2,3,1,3,1,2) X3 <- c(3,2,3,1,2,1) n <- c(6,5,4,3,2,1) test <- data.frame(X1,X2,X3,n) ## fit the weighted distance-based model with Spearman's foot distance ## wdbm(test,dtype="foot")
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