只有达到这么一点，传统的指数跟踪在这方面有一个逻辑优势：按照定义，一个以价值为权重的指数代表所有投资者的业绩。
Only up to a point. Conventional index-tracking has a logical advantage on its side: a value-weighted index represents, by definition, the performance of all investors.
测试用例的权重，它虑及了更多粒度的诚实的结果报告，因而提高了数据结果的价值。
Test case weight, which allows for more granular and honest results reporting, thus increasing the value of your data results.
但是，如果情况并非如此，高价股在市场价值指数中的权重将会高估，而低价股则会低估。
But if they are not, market-value indices will tend to overweight expensive stocks and underweight cheap ones.
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