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Estimation and testing stationarity for double‐autoregressive models

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  • Shiqing Ling
Abstract
Summary. The paper considers the double‐autoregressive model yt = φyt−1+ɛt with ɛt =. Consistency and asymptotic normality of the estimated parameters are proved under the condition E ln |φ +√αηt| 1 as well as . It is well known that all kinds of estimators of φ in these cases are not normal when ɛt are independent and identically distributed. Our result is novel and surprising. Two tests are proposed for testing stationarity of the model and their asymptotic distributions are shown to be a function of bivariate Brownian motions. Critical values of the tests are tabulated and some simulation results are reported. An application to the US 90‐day treasury bill rate series is given.

Suggested Citation

  • Shiqing Ling, 2004. "Estimation and testing stationarity for double‐autoregressive models," Journal of the Royal Statistical Society Series B, Royal Statistical Society, vol. 66(1), pages 63-78, February.
  • Handle: RePEc:bla:jorssb:v:66:y:2004:i:1:p:63-78
    DOI: 10.1111/j.1467-9868.2004.00432.x
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