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What is the Sharpe ratio? What is its purpose?

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夏普比率:夏普比率是将基金的收益减去无风险投资收益,再除以基金的标准差。例如,基金收益是25%,标准差10,国债的收益是5%,夏普指数则为2.0。夏普指数越高,基金风险调整后的回报率越高。
夏普比率的主要优点是标准差作为风险调整的指标,从而不存在业绩基准的相关性问题。任何类型基金的标准差计算方法都一样,所以可用夏普比率在不同类型基金之间进行比较。夏普比率的缺点在于单凭一个绝对数字,难以评定其高低。必须与其他基金或一组基金的夏普指数进行比较,才能对基金业绩有进一步了解。
另外,评估时期越长,指标所体现的风险调整后表现越准确,所以投资者应当同时考察基金收益的连续性。在考虑基金平均收益的基础上,进一步考察每年的收益。然后将每年收益和同类基金中平均水平的基金以及相关的业绩基准进行比较。
总之,选基金的时候,可以先按夏普指数进行排序,在对最好的几只基金做进一步研究。但还需要考虑基金的管理者,投资风格,费用水平等因素。顺便说下,上公募排排网APPPurchase Public Offering Rate1Discount, free subscription fee for private placement on the internet.

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