### Abstract

This paper discusses the large deviation principle of several important statistics for short- and long-memory Gaussian processes. First, large deviation theorems for the log-likelihood ratio and quadratic forms for a short-memory Gaussian process with mean function are proved. Their asymptotics are described by the large deviation rate functions. Since they are complicated, they are numerically evaluated and illustrated using the Maple V system (Char et al., 1991a,b). Second, the large deviation theorem of the log-likelihood ratio statistic for a long-memory Gaussian process with constant mean is proved. The asymptotics of the long-memory case differ greatly from those of the short-memory case. The maximum likelihood estimator of a spectral parameter for a short-memory Gaussian stationary process is asymptotically efficient in the sense of Bahadur.

Original language | English |
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Pages (from-to) | 17-29 |

Number of pages | 13 |

Journal | Australian and New Zealand Journal of Statistics |

Volume | 40 |

Issue number | 1 |

Publication status | Published - 1998 Mar |

Externally published | Yes |

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### Keywords

- Bahadur efficiency
- Gaussian process
- Large deviation principle
- Long-memory process
- Maximum likelihood estimator
- Short-memory process
- Spectral density

### ASJC Scopus subject areas

- Statistics and Probability

### Cite this

*Australian and New Zealand Journal of Statistics*,

*40*(1), 17-29.