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#' Interpret Kendall's Coefficient of Concordance *W*
#'
#' @param w Value or vector of Kendall's coefficient of concordance.
#' @param rules Can be `"landis1977"` (default) or a custom set of [rules()].
#'
#' @section Rules:
#'
#' - Landis & Koch (1977) (`"landis1977"`; default)
#' - **0.00 <= w < 0.20** - Slight agreement
#' - **0.20 <= w < 0.40** - Fair agreement
#' - **0.40 <= w < 0.60** - Moderate agreement
#' - **0.60 <= w < 0.80** - Substantial agreement
#' - **w >= 0.80** - Almost perfect agreement
#'
#' @references
#' - Landis, J. R., & Koch G. G. (1977). The measurement of observer agreement
#' for categorical data. Biometrics, 33:159-74.
#'
#' @keywords interpreters
#' @export
interpret_kendalls_w <- function(w, rules = "landis1977") {
rules <- .match.rules(
rules,
list(
landis1977 = rules(c(0.2, 0.4, 0.6, 0.8),
c(
"slight agreement", "fair agreement", "moderate agreement",
"substantial agreement", "almost perfect agreement"
),
name = "landis1977",
right = FALSE
)
)
)
interpret(w, rules)
}
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