Obtain the quarterly, seasonally-adjusted US gross domestic product (GDP) in the FRED dataset GDP (beginning in 1947).

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Obtain the quarterly, seasonally-adjusted US gross domestic product (GDP) in the FRED dataset GDP (beginning in 1947). Test for a unit root in the \(\log \mathrm{CDF}\).

Use six different tests: augmented Dickey-Fuller, Elliott-Rothenberg-Stock, Kwiatkowski-Phillips-Schmidt-Shin (KPSS), Phillips-Perron, Schmidt-Phillips, and Zivot-Andrews. See Table 5.1.

Table 5.1:

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