install.packages("devtools")

library(devtools)

install_github("Jiazetian/Reliable-change-index-RCI-/RCI")

library(RCI)

Before <- c(15,18,20,16,17,18,19,19,16,17)

After <- c(30,27,25,28,26,29,30,27,25,28)

aa<-data.frame(Before,After)

RCI(aa$Before,aa$After)