Nothing
## mandelkTestR
## Part of the R package: PMCMRplus
##
## Copyright (C) 2017, 2018 Thorsten Pohlert
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## A copy of the GNU General Public License is available at
## http://www.r-project.org/Licenses/
##
##
#' @name mandelkTest
#' @title Mandel's k Test According to E 691 ASTM
#' @description The function calculates the
#' consistency statistics k and corresponding
#' p-values for each group (lab) according to Practice E 691 ASTM.
#' @seealso
#' \code{\link{qmandelk}} \code{\link{pmandelk}}
#'
#' @inherit Mandel-h references
# @references
# Practice E 691, 2005, \emph{Standard Practice for
# Conducting an Interlaboratory Study to Determine the
# Precision of a Test Method}, ASTM International.
#'
#' @template class-mandel
#'
#' @importFrom stats complete.cases
#' @importFrom stats sd
#' @importFrom stats pf
#' @importFrom stats qf
#' @keywords htest
#' @examples
#' data(Pentosan)
#' mandelkTest(value ~ lab, data=Pentosan, subset=(material == "A"))
#' @export
mandelkTest <- function(x, ...) UseMethod("mandelkTest")
#' @rdname mandelkTest
#' @method mandelkTest default
#' @aliases mandelkTest.default
#' @template one-way-parms
#' @export
mandelkTest.default <- function(x, g, ...)
{
if (is.list(x)) {
if (length(x) < 2L)
stop("'x' must be a list with at least 2 elements")
DNAME <- deparse(substitute(x))
x <- lapply(x, function(u) u <- u[complete.cases(u)])
k <- length(x)
l <- sapply(x, "length")
if (any(l == 0))
stop("all groups must contain data")
g <- factor(rep(1 : k, l))
x <- unlist(x)
}
else {
if (length(x) != length(g))
stop("'x' and 'g' must have the same length")
DNAME <- paste(deparse(substitute(x)), "and",
deparse(substitute(g)))
OK <- complete.cases(x, g)
x <- x[OK]
g <- g[OK]
if (!all(is.finite(g)))
stop("all group levels must be finite")
g <- factor(g)
k <- nlevels(g)
if (k < 2)
stop("all observations are in the same group")
}
## Cell averages
xbar <- tapply(x, g, mean)
## Cell standard deviation
s <- tapply(x, g, sd)
## make mean n
n <- mean(tapply(x, g, length))
## repeatability standard deviation
sr <- sqrt(sum(s^2)/k)
## k-statistic
kstat <- s/sr
## two.sided upper quantile
pval <- pmandelk(q=abs(kstat), k=k, n =n, lower.tail=FALSE)
##
METHOD <- "Mandel's k-test"
ans <- list(method = METHOD,
data.name = DNAME,
p.value = pval,
statistics = kstat,
grouplev = levels(g),
nrofrepl = n,
alternative = "two.sided")
class(ans) <- "mandel"
ans
}
#' @rdname mandelkTest
#' @method mandelkTest formula
#' @aliases mandelkTest.formula
#' @template one-way-formula
#' @export
mandelkTest.formula <-
function(formula, data, subset, na.action, ...)
{
mf <- match.call(expand.dots=FALSE)
m <- match(c("formula", "data", "subset", "na.action"), names(mf), 0L)
mf <- mf[c(1L, m)]
mf[[1L]] <- quote(stats::model.frame)
if(missing(formula) || (length(formula) != 3L))
stop("'formula' missing or incorrect")
mf <- eval(mf, parent.frame())
if(length(mf) > 2L)
stop("'formula' should be of the form response ~ group")
DNAME <- paste(names(mf), collapse = " by ")
names(mf) <- NULL
y <- do.call("mandelkTest", c(as.list(mf)))
y$data.name <- DNAME
y
}
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.