What is the order of integration of the time series gdp from the Wooldridge package? Use a 5% significance level and the appropriate variant of the Augmented Dickey-Fuller Unit Root Test in the ur.df function from the urca package.

library('wooldridge')
library('urca')
data(inven)
inven$gdp

Question

What is the order of integration of the time series  gdp  from the Wooldridge package? Use a 5% significance level and the appropriate variant of the Augmented Dickey-Fuller Unit Root Test in the  ur.df  function from the  urca  package. 
 
 library('wooldridge') 
 library('urca') 
 data(inven) 
 inven$gdp

Accepted Answer

The time series is integrated of the first order, and the test needs to be executed twice to determine this.

Answer

Since the different types of tests give different results, the test is inconclusive.

Answer

The time series is integrated of the second or higher order.

Answer

The time series is integrated of order zero, as the test statistic does not lie within the critical region.

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What is the order of integration of the time series gdp from the Wooldridge pa...

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