Intraclass correlation coefficient (Shrout & Fleiss 1979)

Usage

intraclass_correlation(data, targets, raters, ratings, icc_type = "ICC3k")

Arguments

data: Long-format data frame.
targets: Subject ID column.
raters: Rater ID column.
ratings: Numeric rating column.
icc_type: One of "ICC1", "ICC1k", "ICC2", "ICC2k", "ICC3", "ICC3k".

Value

An object of class "morie_test_result".

Examples

set.seed(1)
d <- data.frame(
  s = rep(1:20, each = 3),
  r = rep(1:3, 20),
  v = rep(rnorm(20), each = 3) + rnorm(60, sd = 0.4))
res <- intraclass_correlation(d, "s", "r", "v", icc_type = "ICC2")
res
#> Intraclass correlation (ICC2)
#> -----------------------------
#>   statistic = 18.2308
#>   p-value   = 1.37557e-13
#>   df        = 19
#>   estimate  = 0.853379
#>   effect    = 0.853379
#>   n         = 20