  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")



