Long Agricultural Futures Prices: ARCH, Long Memory, or Chaos Processes?

Anning Wei and Raymond M. Leuthold
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Anning Wei: Rabobank, Hong Kong
Raymond M. Leuthold: University of Illinois at Urbana-Champaign

Finance from University Library of Munich, Germany

Abstract: Price series that are 21.5 years long for six agricultural futures markets, corn, soybeans, wheat, hogs, coffee and sugar, possess characteristics consistent with nonlinear dynamics. Three nonlinear models, ARCH, long memory and chaos, are able to produce these symptoms. Using daily, weekly and monthly data for the six markets, each of these models is tested against the martingale difference null, one-by-one. Standard ARCH tests suggest that all series might contain ARCH effects, but further diagnostics show that the series are not ARCH processes, failing to reject the null. A long-memory technique, the AFIMA model, fails to find long-memory structures in the data, except for sugar. This allows chaos analysis to be applied directly to the raw data. Carefully specifying phase space, and utilizing correlation dimension and Lyapunov exponent together, the remaining five price series are found to be chaotic processes.

Keywords: futures markets; ARCH; chaos (search for similar items in EconPapers)
JEL-codes: Q (search for similar items in EconPapers)
Pages: 56 pages
Date: 1998-05-04
New Economics Papers: this item is included in nep-ets and nep-fmk
Note: Type of Document - pdf; prepared on PC; to print on HP Laserjet; pages: 56; figures: included. Office for Futures and Options Research (OFOR) at the University of Illinois at Urbana-Champaign. Working Paper 98-03. For a complete list of OFOR working papers see
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Citations: View citations in EconPapers (19)

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