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A new t-test for the R/S analysis and long memory in agricultural commodity prices

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  • Hyun Jin
  • Darren Frechette

Abstract

This article tests for long memory in daily and weekly agricultural cash price returns, using the modified rescaled range (R/S) test. A new corrected t-test is constructed for the R/S test to measure statistical significance properly. Empirical results indicate evidence of long memory in more than half of the agricultural commodities analysed. However, the values of estimated H statistics are less than 0.6, indicating relatively weak memory. The corrected t-test reduces type-I error for H statistics on the persistent long memory side and increases the power of the test for H statistics on the anti-persistent side.

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  • Hyun Jin & Darren Frechette, 2004. "A new t-test for the R/S analysis and long memory in agricultural commodity prices," Applied Economics Letters, Taylor & Francis Journals, vol. 11(11), pages 661-667.
    • Handle: RePEc:taf:apeclt:v:11:y:2004:i:11:p:661-667
    DOI: 10.1080/1350485042000240093
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    2. Power, Gabriel J. & Turvey, Calum G., 2010. "Long-range dependence in the volatility of commodity futures prices: Wavelet-based evidence," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 389(1), pages 79-90.

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