Nothing
#' @export
nnd<-function(Cell1, Cell2, Cell3, Cell4){
Prev<-(Cell1+Cell3)
Prev0<-(Cell2+Cell4)
Sens<-(Cell1/Prev)
Spec<-(Cell3/Prev0)
NND<-1/((Sens+Spec)-1)
message(paste('Number Needed to Diagnose =',(NND)))}
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