Uses a bootstrap procedure to generate confidence intervals for the mean colour distance between two or more samples of colours

bootcoldist(vismodeldata, by, boot.n = 1000, alpha = 0.95,
  cores = getOption("mc.cores", 2L), ...)



(required) quantum catch colour data. Can be the result from vismodel(), or colspace(). Data may also be independently calculated quantum catches, in the form of a data frame with columns representing photoreceptors.


(required) a numeric or character vector indicating the group to which each row from the object belongs to.


number of bootstrap replicates (defaults to 1000)


the confidence level for the confidence intervals (defaults to 0.95)


number of cores to be used in parallel processing. If 1, parallel computing will not be used. Defaults to getOption("mc.cores", 2L)


other arguments to be passed to coldist(). Must at minimum include n and weber. See coldist() for details.


a matrix including the empirical mean and bootstrapped confidence limits for dS (and dL if achro = TRUE).


Maia, R., White, T. E., (2018) Comparing colors using visual models. Behavioral Ecology, ary017 doi: 10.1093/beheco/ary017


if (FALSE) { data(sicalis) vm <- vismodel(sicalis, achro = "bt.dc") gr <- gsub("ind..", "", rownames(vm)) bootcoldist(vm, by = gr, n = c(1, 2, 2, 4), weber = 0.1, weber.achro = 0.1, cores = 1) }