跟踪偏离度标准差法 跟踪偏离度（Tracking Difference）是指数基金单位净 值收益率与其所跟踪标的指数收益率的差值。
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追踪差距(Tracking difference)是拥有ETP 的一个隐性成本，并代表该ETP回报与其基准回报之间的差异;当中最大的差异可以归因于TER。
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Average Tracking Difference 平均偏离度
energy difference tracking method 能量差跟踪法
cost difference tracking 成本差异跟踪
phase difference tracking 相位差跟踪
time difference of arrival tracking 时间差跟踪
·2,447,543篇论文数据，部分数据来源于NoteExpress
That's a risk, say researchers, which they address by tracking people over time, to see how happy they were before marrying and what difference marriage made.
BBC: Why it's hard to measure happiness
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