#' Function to return the RA2 hydrologic indicator statistic for a given data frame
#'
#' This function accepts a data frame that contains a column named "discharge" and calculates
#' RA2; Variability in rise rate. Compute the standard deviation for the positive flow changes. RA2 is 100 times
#' the standard deviation divided by the mean (percent-spatial).
#'
#' @param qfiletempf data frame containing a "discharge" column containing daily flow values
#' @return ra2 numeric containing RA2 for the given data frame
#' @export
#' @examples
#' qfiletempf<-sampleData
#' ra2(qfiletempf)
ra2 <- function(qfiletempf) {
meanra2 <- ra1(qfiletempf, pref = "mean")
diffbtdays <- diff(qfiletempf$discharge, lag = 1,
differences = 1)
findrisevalues <- subset(diffbtdays, diffbtdays >
0)
sddra2 <- sd(findrisevalues)
ra2 <- (sddra2 * 100)/meanra2
return(ra2)
}
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