单项选择题:
An analyst is doing research about survivorship bias and its impact on measurement ratios. With a failure to ply with performance presentation standard, hedge fund databases and indexes, which are most likely to overstate:（）
A. Sharpe ratios. B. standard deviation of retums. C. correlations with returns from mon stocks.
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答案：A
解析: 由于存在生存偏差，最后纳入统计的都是生存下来的组合的业绩，故会高估收益，低估风险(风险用回报的标准差来衡量)，同时低估与股票、债券的相关性。另外，高估收益，低估风险会高估夏普比率。