Nothing
# Computation of EWMA ARLs (mean monitoring, t distributed data)
xtewma.arl <- function(l, c, df, mu, zr=0, hs=0, sided="two", limits="fix", mode="tan", q=1, r=40) {
if ( l<=0 || l>1 )
warning("l is typically between 0 and 1 -- you should really know what you do")
if ( c<=0 )
warning("usually, c has to be positive")
if ( df < 1 )
stop("df must be greater or equal to 1")
if ( zr>c & sided=="one" )
stop("wrong reflexion border")
if ( (sided=="two" & abs(hs)>c) | (sided=="one" & (hs<zr | hs>c)) )
warning("unusual headstart")
if ( r<4 )
stop("r is too small")
ctyp <- pmatch(sided, c("one", "two")) - 1
if ( is.na(ctyp) )
stop("invalid ewma type")
ltyp <- -1 + pmatch(limits, c("fix", "vacl"))
if ( is.na(ltyp) )
stop("invalid limits type")
ntyp <- -1 + pmatch(mode, c("identity", "sin", "sinh", "tan"))
if ( is.na(ntyp) )
stop("substitution type not provided (yet)")
q <- round(q)
if ( q<1 )
stop("wrong change point position (q)")
if ( limits=="fix" & q>1 ) {
arl <- .C("xtewma_arl",as.integer(ctyp),as.double(l),
as.double(c),as.double(zr),as.double(hs),as.integer(df),
as.double(mu),as.integer(ltyp),as.integer(r),as.integer(ntyp),as.integer(q),
ans=double(length=q), PACKAGE="spc")$ans
} else {
arl <- .C("xtewma_arl",as.integer(ctyp),as.double(l),
as.double(c),as.double(zr),as.double(hs),as.integer(df),
as.double(mu),as.integer(ltyp),as.integer(r),as.integer(ntyp),as.integer(q),
ans=double(length=1), PACKAGE="spc")$ans
}
names(arl) <- NULL
return (arl)
}
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