14.3. Using the same data as in Exercise 14.2, a researcher tests for a stochastic trend in...

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14.3. Using the same data as in Exercise 14.2, a researcher tests for a stochastic trend in ln(IPt), using the following regression:

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where the standard errors shown in parentheses are computed using the homoskedasticity-only formula and the regressor t is a linear time trend.

a. Use the ADF statistic to test for a stochastic trend (unit root) in ln(IP).

b. Do these results support the specification used in Exercise 14.2?
Explain.

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Introduction To Econometrics

ISBN: 9781292071367

3rd Global Edition

Authors: James Stock, Mark Watson

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