Summary:
We adapt smoothing methods to histogram-valued time series (HTS) by introducing a barycentric histogram that emulates the “average” operation, which is the key to any smoothing filter. We show that, due to its linear properties, only the Mallows-barycenter is acceptable if we wish to preserve the essence of any smoothing mechanism. We implement a barycentric exponential smoothing to forecast the HTS of daily histograms of intradaily returns to both the SP500 and the IBEX 35 indexes. We construct a one-step-ahead histogram forecast, from which we retrieve a desired ? -value-at-risk (VaR) forecast. In the casse of the SP500 index, a barycentric exponential smoothing delivers a better forecast, in the MSE sense, than those derived from vector autoregression models, especially for the 5% VaR. In the case of IBEX35, the forecasts from both methods are equally good.
Keywords: symbolic data; exponential smoothing; barycenter; high-frequency data; value-at-risk
JCR Impact Factor and WoS quartile: 1,300 - Q3 (2022)
DOI reference:
10.1002/sam.10114
Published on paper: April 2011.
Published on-line: March 2011.
Citation:
J. Arroyo, G. González-Rivera, C. Maté, A. Muñoz Smoothing methods for histogram-valued time series. An application to Value-at-Risk. Statistical Analysis and Data Mining. Vol. 4, nº. 2, pp. 216 - 228, April 2011. [Online: March 2011]
