Augmented Dickey-Fuller Test before differencing

Variable

Test statistic

Critical value

p-value

Conclusion

Food

−0.82261

−3.44

0.9579

Fail to reject H0

Non-food

−0.48382

−3.44

0.9816

Fail to reject H0

Augmented Dickey-Fuller Test after differencing

Column1

Test statistic

Critical value

p-value

Conclusion

Food

−5.3269

−3.44

0.01

Reject H0

Non-food

−5.8307

−3.44

0.01

Reject H0