跟踪误差（trackingerror）是为了衡量指数基金的投资风险而提出的一个概念。一般而言，跟踪误差被定义为指数化投资组合与基准投资组合收益率之间的差额。
Tracking error measures the investment risk of index fund , which is defined as yield difference between the index portfolio and the benchmark portfolio .
基准投资收益率