According to the statistical data of China's fiscal revenue Y and GDP X during 1978-20000, the following econometric model can be established:
Please answer the following questions:
(2) Test whether there is first-order autocorrelation and related direction in this model. Why?
(3) What influence will autocorrelation have on the econometric model established?
(The critical value: dL=1.24, du =1.43 )
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