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A Note on the Durbin-Watson Test

In this note we indicate a curious feature of the Durbin-Watson Test (DWT). While DWf is discussed in most standard econometrics texts such as Goldberger, Johnston, or Malinvaud, the following point about the hypotheses under test is rarely mentioned. Unlike the usual situation, the investigator has an interest in accepting the null hypothesis. A higher level of significance will make his task easier rather than more difficult. This point is explained in greater detail below. Typically, the hypotheses that an economist tests with the DWT are: