  exportPattern("^[[:alpha:]]+")
  importFrom("stats", "as.ts", "lag", "median", "na.omit", "sd", "var")
  importFrom("stats", "cor")
  importFrom("graphics", "plot", "text")
  importFrom("stats", "pnorm", "lm")
  importFrom("graphics", "abline", "par", "title")
  importFrom("stats", "scatter.smooth")
  importFrom("utils", "read.csv")
  importFrom("graphics", "hist")
  importFrom("stats", "ts.plot")
  importFrom("graphics", "lines")
  importFrom("stats", "density")
  importFrom("utils", "combn")
  importFrom("stats", "as.formula")
  importFrom("stats", "runif")
  importFrom("stats", "qqline", "qqnorm")
  importFrom("stats", "lm.fit")
  importFrom("stats", "IQR")
  import("ggplot2")
  import("grid")
  import("gridExtra")
  importFrom("stats", "is.ts", "loess", "time", "ts.union")
  importFrom("utils", "installed.packages")
  importFrom("utils", "install.packages", "update.packages")
