ABSTRACT
ItwasmentionedalreadybySubbaRaoandGabr(1980)thatEqns(2.1) and(2.2)mayholdinnon-Gaussianandnon-linearcases,andthemain criticismleveledagainstthebispectrumtesthasbeenthatitfailstodetect certainsymmetricnonlinearpatternsandthatitneedsconsiderablymore observationstomatchthepowerofthebestparametrictestforagiven alternative.
