Nothing
`restrictY` <-
function(d,y,r,level,verbose=0) {
if (sum(y^2, na.rm = TRUE) == 0) return(y)
switch(level,
"nominal"=return(nominalY(d,y,r,verbose=verbose)),
"ordinal"=return(ordinalY(d,y,r,verbose=verbose)),
"numerical"=return(numericalY(d,y,r,verbose=verbose)),
"polynomial"=return(polynomialY(d,y,r,verbose=verbose)))
}
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