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Transcript
第åä¹å±äºå¤ªè²¡åç¶æ¿æè¨å管理æè° Random Walk Hypothesis ï» ï½ E ï©ï« rt ï«ï´ ï E ï¨ r ï©ï¹ï» ï©ï«rt ï E ï¨ r ï©ï¹ï» ï½ 0 âThe series looks like a âwanderingâ one, almost as if once a week the Demon of Chance drew a random number from a symmetrical population of fixed dispersion and added it to the current price to determine the next weekâs priceâ Kendall (1953)
