aThere is also found a one-way causal effect running from spot returns to the volatility of spot price index at the significant of 5% (0,019) level of significance. 那裡也被找到跑從斑點回歸的一個單程原因作用到現貨價格索引的揮發性在重大5% (0,019)顯著水準。 [translate] ...