Nothing
Sxy = function(x, y = x, na.rm = FALSE){
if(na.rm){
x = na.omit(x)
y = na.omit(y)
}
if(length(x) == length(y)){
return(sum( (x - mean(x)) * (y - mean(y))))
} else {
warning("Variables must have same length!")
}
}
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