exportPattern("^[[:alpha:]]+")
importFrom("graphics", "abline", "axis", "barplot", "hist", "lines",
             "mtext", "par", "plot", "text")
importFrom("stats", "density", "qqline", "qqnorm", "quantile", "rnorm",
             "shapiro.test", "var")
importFrom("grDevices", "dev.new")
importFrom("stats", "dnorm")
importFrom("grDevices", "rgb")