Nothing
QiniArea <- function(x, adjusted=FALSE){
# Computes the area under the Qini curve.
#
# Args:
# x: a table that must be the output of PerformanceUplift() function.
#
# Returns:
# The Qini coefficient.
if (!inherits(x, "PerformanceUplift"))
stop("tools4uplift: object not of class PerformanceUplift")
nb <- length(x$cum_per)
sum <- x$inc_uplift[1]/2*x$T_n[1]/x$T_n[nb]
for (i in 2:nb) {
sum <- sum + (x$inc_uplift[i] + x$inc_uplift[i-1])/2*(x$T_n[i]/x$T_n[nb]-x$T_n[i-1]/x$T_n[nb])
}
qini_area <- sum-x$inc_uplift[nb]/2
if (adjusted == TRUE){
#Compute the Kendall's uplift rank correlation
#Raise a warning if there are missing values in x
x_for_rho <- cbind(x$cum_per, x$uplift)
complete_x_for_rho <- x_for_rho[complete.cases(x_for_rho),]
if (nrow(x_for_rho) > nrow(complete_x_for_rho)){
warning("tools4uplift: there are missing values in your PerformanceUplift object. They will be omitted in the computation of the Kendall's rank correlation.")
}
kendall_uplift <- cor(seq(nrow(complete_x_for_rho),1), complete_x_for_rho[,2], method="kendall")
qini_area <- max(0, qini_area) * kendall_uplift
}
return(qini_area)
}
# END FUN
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