Based on feedback random walk model, using the influence and effect distribution resulting from determinative and random factors, the Shanghai stock composite index from 1998 to 2000 is imitated.

针对随机游走分析在股市价格模拟中的固定漂移率、后效性等缺点，提出了反馈式随机游走模型。

youdao

Doesn't this contradict his support for index funds in his book A Random Walk Down Wall Street?

FORBES: About Burton Malkiel

And then finally, the other thing I've always been a big believer in, and Forbes magazine has been a great supporter from the very beginning of my Random Walk book, and that is put your money in low-cost index funds.

FORBES: Intelligent Investing Briefing Book