Null Hypothesis: R has a unit root

Exogenous: Constant

Lag Length: 0 (Automatic based on SIC, MAXLAG = 13)

t-Statistic

Prob.^*

Augmented Dickey-Fuller test statistic

−12.47478

0.0000

Test critical values:

1% level

−3.467633

5% level

−2.877823

10% level

−2.575530