Hi All, I want to use "hist" to get the relative frequency plot. But the range of ylab is greater than 1,which I think it should be less than 1 since it stands for the probability. Here is my code: x<-c(1,1,1,0,0,1,1,5,1,1,0,1,1,0,1,0,1,1,0,0,1,1,1,1,1,1,1,1,1,4,1,0,2,1,1,1 ,1,1,0,0,1,0,1,1,1,1,1,1,1,1,1) hist(x,breaks=52,main=NULL,freq=FALSE,border=TRUE,xlab="days",xlim=c(0,6),yl im=c(0,10),lty=2) But when I tried the other vector,the ylab is less than 1.The code is: y<-c(6,4,6,6,4,6,5,4,7,5,6,6,8,6,17,9,8,4,6,3,5,8,7,12,5,10,6,4,6,13,7,6,6,2 5,4,9,9,6,6,6,6,6,9,4,5,5,4,10,5,7,6)