Using Daily High/Low Time to Test for Intraday Random Walk in Two Index Futures Markets

Debby M.Y. Mok, K. Lam, W. Li

    Research output: Contribution to journalJournal articlepeer-review

    5 Citations (Scopus)


    This paper investigates the time of the daily high/low price in the Hang Seng and S&P 500 index futures and uses it to test for deviation from the predictive behavior of an intraday random walk model. Theoretical distributions of the daily high/low time under the random walk model are derived assuming either uniform or time-varying intraday trading speed. We show that under a random walk model, daily high/low time is more likely to occur near market open/close than in the middle of the trading day. Empirical distributions of the daily high/low time are compared with its theoretical distributions to test for the random walk model. It is found that for the intraday movement of the S&P 500 futures, the random walk hypothesis cannot be rejected. However, it is discovered that in the Hong Kong market, daily high/low time tends to appear significantly more often than is predicted by the random walk model in the first 15-minute time interval when the market opens in the morning or in the afternoon. The results remain valid even after we have taken the time-varying trading speed into account. By comparing the price behavior across markets, we can better understand the microstructure of the futures market.

    Original languageEnglish
    Pages (from-to)381-397
    Number of pages17
    JournalReview of Quantitative Finance and Accounting
    Issue number4
    Publication statusPublished - Jun 2000

    Scopus Subject Areas

    • Accounting
    • Business, Management and Accounting(all)
    • Finance

    User-Defined Keywords

    • index futures
    • market microstructure
    • intraday trading
    • random walk hypothesis
    • high/low time


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