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