15.7 감마 분포 (Gamma Distribution) : stat_function(fun = dgamma)

# 감마 분포 : fun = dgamma
ggplot(data.frame(x=c(0, 400)), aes(x=x)) +
   stat_function(fun=dgamma, args=list(shape=5, rate=0.05), colour="green") +
   ggtitle("Gamma Distribution of (shape=5, rate=0.05)")