It is quite common that the structure of a time series changes abruptly. Identifying these change points and describing the model structure in the segments between these change points is of interest. In this paper, time series data is modelled assuming each segment is an autoregressive time series with possibly different autoregressive parameters. This is achieved using two main steps. The first step is to use a likelihood ratio scan based estimation technique to identify these potential change points to segment the time series. Once these potential change points are identified, modified parametric spectral discrimination tests are used to validate the proposed segments. A numerical study is conducted to demonstrate the performance of the proposed method across various scenarios and compared against other contemporary techniques.
|Number of pages||22|
|Early online date||13 Jul 2020|
|Publication status||Published - Aug 2020|
|Event||Workshop on Change Point Detection Limit Theorems, Algorithms, and Applications in Life Sciences - Greifswald, Germany|
Duration: 8 Jul 2019 → 10 Jul 2019
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- Changepoint detection
- Autoregressive time series
- Likelihood ratio scan statistics
- Multiple testing problems