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#' @importFrom rlang list2
#' @importFrom stats pchisq
#'
#' @export
#'
#' @references Chaipitak, S. and Chongcharoen, S. (2013). A test for
#' testing the equality of two covariance matrices for high-dimensional
#' data. Journal of Applied Sciences, 13(2):270-277.
#' \href{http://doi.org/10.3923/jas.2013.270.277}{10.3923/jas.2013.270.277}
#' @rdname homogeneityStatistics
Chaipitak2013 <- function(x, ...){
ls <- list2(...)
matrix_ls <- x
statistic <- Chaipitak2013Stat(matrix_ls)
xmin <- names(matrix_ls[1])
xmax <- names(matrix_ls[length(matrix_ls)])
xother <- names(matrix_ls[-c(1, length(matrix_ls))])
data.name <- Reduce(paste0, past(xmin = xmin, xother, xmax = xmax))
names(statistic) <- "Chi-Squared"
parameter <- length(matrix_ls) - 1
names(parameter) <- "df"
null.value <- 0
names(null.value) <- "difference in covariance matrices"
p.value <- 1 - pchisq(statistic, parameter)
obj <- list(statistic = statistic,
parameter = parameter,
p.value = p.value,
estimate = NULL,
null.value = null.value,
alternative = "two.sided",
method = "Chaipitak and Chongchareon 2013 Homogeneity of Covariance Matrices Test",
data.name = data.name)
class(obj) <- "htest"
obj
}
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