Abstract
There has been much attention in recent years to the problem of detecting mean changes in a piecewise constant time series. Often, methods assume that the noise can be taken to be independent, identically distributed (IID), which in practice may not be a reasonable assumption. There is comparatively little work studying the problem of mean changepoint detection in time series with non-trivial autocovariance structure. In this article, we propose a likelihood-based method using wavelets to detect changes in mean in time series that exhibit time-varying autocovariance. Our proposed technique is shown to work well for time series with a variety of error structures via a simulation study, and we demonstrate its effectiveness on two data examples arising in economics.
Original language | English |
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Journal | Stat |
Publication status | Acceptance date - 16 Dec 2020 |
Keywords
- changepoint
- wavelets
- locally stationary
- autocorrelation