Null Hypothesis: D (IFR) has a unit root

Exogenous: Constant, Linear Trend

Lag Length: 4 (Automatic—based on AIC, maxlag = 4)

t-Statistic

Prob.*

Augmented Dickey-Fuller test statistic

−3.543375

0.0455

Test critical values:

1% level

−4.055416

5% level

−3.456805

10% level

−3.154273