#' @importFrom rlang list2
#' @importFrom stats pnorm
#'
#' @export
#'
#' @references Ahmad, R. (2017). Location-invariant test of homogeneity
#' of large-dimensional covariance matrices. Journal of Statistical
#' Theory and Practice, 11(4):731-745.
#' \href{http://doi.org/10.1080/15598608.2017.1308895}{10.1080/15598608.2017.1308895}
#' @rdname homogeneityStatistics
Ahmad2017 <- function(x, ...){
ls <- list2(...)
samples <- order(sapply(x, function(dat){
nrow(dat)
}), decreasing = TRUE)
matrix_ls <- x[samples]
statistic <- Ahmad2017Stat(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) <- "Standard Normal"
parameter <- c(0, 1)
names(parameter) <- c("Mean", "Variance")
null.value <- 0
names(null.value) <- "difference in covariance matrices"
p.value <- 1 - pnorm(abs(statistic))
obj <- list(statistic = statistic,
parameter = parameter,
p.value = p.value,
estimate = NULL,
null.value = null.value,
alternative = "two.sided",
method = "Ahmad 2017 Homogeneity of Covariance Matrices Test",
data.name = data.name)
class(obj) <- "htest"
obj
}
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