import(MASS, survey)
export(svycollinear, svyCooksD, svydfbetas, svydffits, svyhat, svystdres, svyvif, Vmat)
importFrom("graphics", 
    "abline", 
    "plot")
importFrom("stats", 
    "glm.fit", 
    "model.matrix", 
    "predict", 
    "residuals", 
    "var", 
    "vcov", 
    "weighted.mean")
importFrom("utils", 
    "head")
importFrom("Matrix", 
    "bdiag")
