Abstract
This paper shows how nonparametric likelihood inference for autoregressive models can be based on the family of “empirical” Cressie–Read statistics. The results of the paper apply to possibly nonstationary autoregressive models with innovations that form a martingale difference sequence, and can accommodate multiple and complex unit roots, as well as deterministic components. As an application, the paper considers nonparametric likelihood-based tests for seasonal unit roots and for double unit roots. Monte Carlo evidence seems to suggest that the proposed tests have competitive finite sample properties.
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