Nothing
yuen <- function(formula, data, tr = 0.2, ...){
if (missing(data)) {
mf <- model.frame(formula)
} else {
mf <- model.frame(formula, data)
}
cl <- match.call()
xy <- split(model.extract(mf, "response"), mf[,2])
faclevels <- names(xy)
x <- xy[[1]]
y <- xy[[2]]
if (tr==0.5) warning("Comparing medians should not be done with this function!")
alpha <- 0.05
if(is.null(y)){
if(is.matrix(x) || is.data.frame(x)){
y=x[,2]
x=x[,1]
}
if(is.list(x)){
y=x[[2]]
x=x[[1]]
}
}
#if(tr==.5)stop("Using tr=.5 is not allowed; use a method designed for medians")
if(tr>.25)print("Warning: with tr>.25 type I error control might be poor")
x<-x[!is.na(x)] # Remove any missing values in x
y<-y[!is.na(y)] # Remove any missing values in y
h1<-length(x)-2*floor(tr*length(x))
h2<-length(y)-2*floor(tr*length(y))
q1<-(length(x)-1)*winvar(x,tr)/(h1*(h1-1))
q2<-(length(y)-1)*winvar(y,tr)/(h2*(h2-1))
df<-(q1+q2)^2/((q1^2/(h1-1))+(q2^2/(h2-1)))
crit<-qt(1-alpha/2,df)
dif<-mean(x,tr)-mean(y,tr)
low<-dif-crit*sqrt(q1+q2)
up<-dif+crit*sqrt(q1+q2)
test<-abs(dif/sqrt(q1+q2))
yuen<-2*(1-pt(test,df))
es=abs(yuenv2(x,y,tr=tr)$Effect.Size)
result <- list(test = test, conf.int = c(low, up), p.value = yuen, df = df, diff = dif, effsize = es, call = cl)
class(result) <- "yuen"
result
}
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