Nothing
excessReturn <- function(firm.returns, market.returns) {
stopifnot(NROW(firm.returns) == NROW(market.returns))
stopifnot("zoo" %in% class(firm.returns) || "xts" %in% class(firm.returns))
stopifnot("zoo" %in% class(market.returns) || "xts" %in% class(market.returns))
return(firm.returns - market.returns)
}
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