exportPattern("^[[:alpha:]]+")
importFrom("grDevices", "dev.off", "dev.new", "jpeg", "pdf", "tiff")
importFrom("graphics", "abline", "axis","segments","curve","lines", "par", "plot","points","box","polygon", "text","mtext")
importFrom("stats", "na.omit", "qbeta")
importFrom("utils", "packageVersion")