Nothing
ROC.s <-
function(x1=NULL,x2=NULL, by=NULL) {
args <- match.call()
if(!is.null(args$x1) & !is.null(args$x2) & !is.null(args$by))
stop("Factor interaction terms (by argument) are not allowed in surface interactions")
if(is.null(args$x1) & is.null(args$x2))
stop("x1 or x2 must be indicated")
if(!is.null(args$x1) & is.null(args$x2) & is.null(args$by)) {
cov = c("", deparse(args$x1, backtick = TRUE, width.cutoff = 500))
} else if (!is.null(args$x1) & !is.null(args$x2) & is.null(args$by)) {
cov = c(deparse(args$x1, backtick = TRUE, width.cutoff = 500),deparse(args$x2, backtick = TRUE, width.cutoff = 500))
} else if (!is.null(args$x1) & is.null(args$x2) & !is.null(args$by)) {
cov = c(deparse(args$by, backtick = TRUE, width.cutoff = 500), deparse(args$x1, backtick = TRUE, width.cutoff = 500))
} else {
stop("Invalid expression")
}
res <- list(cov=cov)
res
}
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