Change Point in Panel Data with Small Fixed Panel Size: Ratio and Non-ratio Test Statistics

0490843 - ÚI 2019 RIV CH eng C - Conference Paper (international conference)
Peštová, Barbora - Pešta, M.
Change Point in Panel Data with Small Fixed Panel Size: Ratio and Non-ratio Test Statistics.
Statistics and Simulation. Cham: Springer, 2018 - (Pilz, J.; Rasch, D.; Melas, V.; Moder, K.), s. 259-271. Springer Proceedings in Mathematics and Statistics, 231. ISBN 978-3-319-76034-6. ISSN 2194-1009. E-ISSN 2194-1017.
[IWS 2015. International Workshop on Simulation /8./. Vienna (AT), 21.09.2015-25.09.2015]
R&D Projects: GA ČR(CZ) GBP402/12/G097
Institutional support: RVO:67985807
Keywords : Change point * Panel data * Change in mean * Hypothesis testing * Structural change * Ratio type statistics
OECD category: Statistics and probability

The main goal is to develop and, consequently, compare stochastic methods for detecting whether a structural change in panel data occurred at some unknown time or not. Panel data of our interest consist of a moderate or relatively large number of panels, while the panels contain a small number of observations. Testing procedures to detect a possible common change in means of the panels are established. Ratio and non-ratio type test statistics are considered. Their asymptotic distributions under the no change null hypothesis are derived. Moreover, we prove the consistency of the tests under the alternative. The advantage of the ratio statistics compared to the non-ratio ones is that the variance of the observations neither has to be known nor estimated. A simulation study reveals that the proposed ratio statistic outperforms the non-ratio one by keeping the significance level under the null, mainly when stronger dependence within the panel is present. However, the non-ratio statistic incorrectly rejects the null in the simulations more often than it should, which yields higher power compared to the ratio statistic.
Permanent Link: http://hdl.handle.net/11104/0284981