Claudio-Quiroga, GloriaGil-Alana, Luis AlberikoMaiza-Larrarte, Andoni2025-12-192025-12-192025-12Claudio-Quiroga, G, Gil-Alana, L A & Maiza-Larrarte, A 2025, 'Mean reversion and long memory dynamics in the Shanghai Containerized Freight Index', Journal of Shipping and Trade, vol. 10, no. 1, 21. https://doi.org/10.1186/s41072-025-00211-52364-4575https://hdl.handle.net/10641/6798Publisher Copyright: © The Author(s) 2025.Este artículo aborda el estudio de las propiedades de memoria larga del Shanghai Containerized Freight Index para el período comprendido entre el 16 de octubre de 2009 y el 18 de octubre de 2024. Mediante métodos de integración fraccionaria, pretendemos determinar si las perturbaciones en la serie tienen efectos transitorios o permanentes. Los resultados indican que la serie es muy persistente cuando se emplea el tamaño muestral completo, con un orden de integración superior a 1. Sin embargo, si separamos tres submuestras diferentes, correspondientes a los períodos previo a la Covid, durante la Covid y posterior a la Covid, observamos reversión a la media en el período previo a la Covid; en cambio, durante la Covid se produce un aumento sustancial del valor de d, que vuelve a disminuir tras la pandemia. [Traducción automática al español; idioma original: inglés.]This paper deals with the investigation of the long memory properties of the Shanghai Containerized Freight Index for the time period from 16 October 2009 to 18 October 2024. Using fractional integration methods, we want to determine if shocks in the series have transitory or permanent effects. The results indicate that the series are very persistent when using the whole sample size with an order of integration above 1. However, if we separate three different subsamples, corresponding to the pre-Covid, Covid and post-Covid periods, we observe reversion to the mean in the pre-Covid period; however, during the Covid, there is a substantial increase in the value of d and turns decreasing after the pandemic.1462403enghttp://creativecommons.org/licenses/by-nc-nd/4.0/Covid-19Fractional integrationLong memoryPersistenceShanghai Containerized Freight IndexGeneral Business, Management and AccountingTransportationGeneral Economics, Econometrics and FinanceYesyesjournal articleopen access10.1186/s41072-025-00211-5https://www.scopus.com/pages/publications/105015430471https://www.scopus.com/pages/publications/105015430471#tab=citedBy