tabela.R

#' @title Produce frequency and relative frequency tables
#'
#' @description Produces a contingency table of the elements of a vector
#' calculating relative frequencies as well.
#'
#' @param x A vector
#' @param label Quoted name of the column to create in output
#'
#' @return A data frame containing frequency and relative frequencies for
#' the levels of x
#'
#' @export
tabela <- function(x, label = "variavel") {
  tab1 <- data.frame(table(x))
  tab2 <- data.frame(prop.table(table(x)) * 100)
  tab3 <- merge(tab1, tab2, by = "x")
  tab3 <- tab3[order(tab3$Freq.y, decreasing = T), ]
  tab3$Freq.y <- round(tab3$Freq.y, 2)
  tab3 <- as.data.frame(rbind(as.matrix(tab3), c("Total", sum(tab1$Freq), "100.0")))
  names(tab3) <- c(label, "Freq\032ncia", "   %")
  tab3
}