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#' @export
youden_index<-function(Cell1, Cell2, Cell3, Cell4){
Prev<-(Cell1+Cell3)
Prev0<-(Cell2+Cell4)
Sens<-(Cell1/Prev)
Spec<-(Cell3/Prev0)
Youden<-(Sens+Spec)-1
message(paste('Youden Index =',(Youden)))}
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