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#' Returns rows from \code{\link{trips}} that were not matched by \code{\link{trimatch}}.
#'
#' This function returns a subset of \code{\link{trips}} that were not matched by
#' \code{\link{trimatch}}. All data frame methods work with the returned object
#' but special \code{summary} function will provided relevant information.
#'
#' @param tmatch the results of \code{\link{trimatch}}.
#' @return a data frame of unmatched rows.
#' @export
unmatched <- function(tmatch) {
tpsa <- attr(tmatch, 'triangle.psa')
unmatched <- tpsa[!(tpsa$id %in% c(tmatch[,1], tmatch[,2], tmatch[,3])),]
class(unmatched) <- c('unmatched', 'triangle.psa', 'data.frame')
attr(unmatched, 'triangle.psa') <- tpsa
return(unmatched)
}
#' Provides a summary of unmatched subjects.
#'
#' Will return as a list and print the percentage of total unmatched rows and
#' percent by treatment.
#'
#' @param object results of \code{\link{unmatched}}
#' @param digits number of digits to print.
#' @param ... currently unused.
#' @return a list of summary results.
#' @export
#' @method summary unmatched
summary.unmatched <- function(object, digits=3, ...) {
tpsa <- attr(object, 'triangle.psa')
results <- list()
results$PercentUnmatched <- nrow(object) / nrow(tpsa)
results$UnmatchedByTreat <- table(object$treat)
results$PercentByTreat <- table(object$treat) / table(tpsa$treat)
results$Unmatched <- table(object$treat)
cat(paste0(nrow(object), ' (',
prettyNum(nrow(object) / nrow(tpsa) * 100, digits=digits),
'%) of ', nrow(tpsa), ' total data points were not matched.'))
cat('\nUnmatched by treatment:\n')
tmp <- paste0(results$UnmatchedByTreat, ' (', prettyNum(results$UnmatchedByTreat /
table(tpsa$treat) * 100, digits=digits), '%)')
names(tmp) <- names(results$UnmatchedByTreat)
print(tmp, quote=FALSE)
invisible(results)
}
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