importFrom("utils", "combn", "head", "tail")
importFrom("stats", "model.matrix", "pf", "predict")
importFrom("doofa", "pwo")
importFrom("crossdes", "MOLS")
importFrom("mixexp", "SCD")
importFrom("combinat", "permn")
importFrom("Rsolnp", "solnp")
export("oofa.oa","PWO","D_effi_pwo","COA","oofa.sld","oofa.scd","mixoofa.anova","find_opt_target")