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An omnibus test to detect time-heterogeneity in time series

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Abstract

This paper focuses on a procedure to test for structural changes in the first two moments of a time series, when no information about the process driving the breaks is available. We model the series as a finite-order auto-regressive process plus an orthogonal Bernstein polynomial to capture heterogeneity. Testing for the null of time-invariance is then achieved by testing the order of the polynomial, using either an information criterion, or a restriction test. The procedure is an omnibus test in the sense that it covers both the pure discrete structural changes and some continuous changes models. To some extent, our paper can be seen as an extension of Heracleous et al. (Econom Rev 27:363–384, 2008).

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Correspondence to Philippe de Peretti.

Appendix: Results of Monte-Carlo simulations

Appendix: Results of Monte-Carlo simulations

See Tables 123456 and 7

 

Table 1 \(AICu\) based criterion for five models, the last four ones exhibiting ruptures in mean
Table 2 Empirical size and power of restriction tests at 4 nominal sizes for five models, the last four ones exhibiting ruptures in mean
Table 3 Empirical size and power of the Andrews–Ploberger test at the 5 % nominal size, for five models, the last four ones exhibiting ruptures in mean
Table 4 Empirical size and power of the CUSUM test at the 5 % nominal size, for five models, the last four ones exhibiting ruptures in mean
Table 5 \(AICu\) based criterion for four models, the last three ones exhibiting ruptures in variance
Table 6 Empirical size and power of restriction tests at 4 nominal sizes for four models, the last three ones exhibiting ruptures in variance
Table 7 Empirical size and power of the CUSUM test at the 5 % nominal size for four models, the last three ones exhibiting ruptures in variance

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Guégan, D., de Peretti, P. An omnibus test to detect time-heterogeneity in time series. Comput Stat 28, 1225–1239 (2013). https://doi.org/10.1007/s00180-012-0356-7

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