The Breusch--Godfrey LM test is one of the most popular tests for autocorrelation. However, it has been shown that the LM test may be erroneous when there exist heteroskedastic errors in a regression model. Recently, remedies have been proposed by Godfrey and Tremayne [9] and Shim <italic>et al.</italic> [21]....

The traditional tests for rationality have often rejected the hypothesis of rationality for survey data on expectations. It has been argued that, in the presence of unit roots, cointegration tests should be applied. The cointegration tests have often failed to reject the hypothesis of...