exportPattern("^[[:alpha:]]+")
S3method(plot, dbkGrad)
S3method(print, dbkGrad)
S3method(residuals, dbkGrad)

importFrom(minpack.lm,nls.lm.control,nls.lm)
importFrom(SDD,ADF)
importFrom(TSA, acf)

importFrom(lattice,levelplot)

