  exportPattern("^[[:alpha:]]+")
  importFrom("grDevices", "dev.off", "pdf", "png")
  importFrom("graphics", "boxplot", "lines", "plot")
  importFrom("stats", "aggregate", "bartlett.test", "dgamma", "isoreg",
             "loess", "lowess", "median", "p.adjust", "pnorm", "predict",
             "pt", "qchisq", "smooth.spline", "var")
  importFrom("utils", "read.table", "write.table")
