A new package, ridittools, is available on CRAN
Description: Functions to compute ridit scores of vectors, compute mean
ridits and their standard errors for vectors compared to a reference
vector,as described in Fleiss (1981, ISBN:0-471-06428-9), and compute
means/SEs for multiple groups in matrices. Data can be either
counts or proportions. Emphasis is on ridit analysis of ordered
categorical data such as Likert items and pain-rating scales.
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