exportPattern("^[[:alpha:]]+")
import(survival)
importFrom("graphics", "hist", "legend", "lines", "mtext", "par", 
           "plot", "points", "segments")
importFrom("stats", "acf", "density", "dnorm", "median", 
           "quantile", "rbeta", "rgamma", "rnorm", "runif", 
           "sd", "var")
