Consider the (operatorname{ARDL}(p, q)) equation and the data in the file usmacro. For (p=2) and (q=1), results

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Consider the \(\operatorname{ARDL}(p, q)\) equation

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and the data in the file usmacro. For \(p=2\) and \(q=1\), results from the LM test for serially correlated errors were reported in Table 9.6 for \(\operatorname{AR}(k)\) or \(\operatorname{MA}(k)\) alternatives with \(k=1,2,3,4\). The \(\chi^{2}=T \times R^{2}\) version of the test, with missing initial values for \(\hat{e}_{t}\) set to zero, was used to obtain those results. Considering again the model with \(p=2\) and \(q=1\), compare the results in Table 9.6 with results from the following alternative versions of the LM test.

1. The \(\chi^{2}=T \times R^{2}\) version of the test, with missing initial values for \(\hat{e}_{t}\) dropped.

2. The \(F\)-test for the joint significance of lags of \(\hat{e}_{t}\), with missing initial values for \(\hat{e}_{t}\) dropped.

3. The \(F\)-test for the joint significance of lags of \(\hat{e}_{t}\), with missing initial values for \(\hat{e}_{t}\) set to zero.

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Principles Of Econometrics

ISBN: 9781118452271

5th Edition

Authors: R Carter Hill, William E Griffiths, Guay C Lim

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