exportPattern("^[[:alpha:]]+")
import("vars","xts","lmtest","tsDyn","sandwich")
importFrom("graphics", "abline", "lines", "plot")
importFrom("stats", "coef", "cor", "cov", "embed", "lm", "pchisq",
               "pf", "plot.ts", "pnorm", "resid")
importFrom("utils", "tail", "write.csv")
