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#' Calculate the relative risk from a 2-by-2 table
#'
#' Computes the relative risk of a specified column of a two-by-two table.
#'
#' @param x A table or matrix containing frequencies.
#' @param col.num The column number upon which relative risk should be calculated.
#'
#' @return A numeric vector.
#' @author Paul W. Egeler, M.S.
#' @export
rel.risk <- function(x, col.num = 1) {
stopifnot(identical(dim(x), c(2L,2L)))
y <- prop.table(x,1)[,col.num]
as.vector(y[1] / y[2])
}
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