Nothing
# Computation of res-EWMA ARLs (scale monitoring)
s.res.ewma.arl <- function(l,cu,sigma,mu=0,alpha=0,n=5,hs=1,r=40,qm=30) {
if ( l <= 0 || l > 1 )
stop("l has to be between 0 and 1")
if ( cu <= 0 )
warning("usually, cu has to be positive")
if ( sigma <= 0 )
stop("sigma must be positive")
if ( abs(alpha) > 1 )
warning("nonstationary AR(1) process")
if ( n < 2 )
warning("n is too small")
n <- round(n)
if ( abs(hs) > cu )
warning("unusual headstart")
if ( r < 4 )
stop("r is too small")
if ( qm < 10 )
stop("qm is too small")
ctyp <- 1 # later more
arl <- .C("s_res_ewma_arl",as.double(alpha),as.integer(n-1),
as.integer(ctyp),as.double(l),
as.double(cu),as.double(hs),
as.double(sigma),as.double(mu),as.integer(r),as.integer(qm),
ans=double(length=1),PACKAGE="spc")$ans
names(arl) <- "arl"
return (arl)
}
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