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Tag Archives: 指数
指数成分股调整对指数表现的影响
今天我发现了一个有意思的话题,指数成分股调整对指数表现的影响,是很多人没有注意到的。 可惜的是这个话题最多出一份研究报告,而不能出论文,所以也就贴在博客上了。 pre是指10年的成分股从10年到现在的表现。 now是指现在的成分股从10年到现在的表现 std是全收益指数的表现 结论1 现在的50成分股跑赢std和pre很正常,因为表现好才能进50。 但50指数的表现,不如不调整,这个结论比较有意思,这个是说,你剔除的成分股,剔除之后,表现比新进入的成分股在进入以后表现的更好。 这说明,在50成分股上,反转效应超过动量效应。 结论2 300的结论和50类似,反转效应超过动量,但是程度比50若很多。 这里虽然图片写的是50,实际上是300,我不高兴改了 结论3 500上,剔除之后和之前,相差很小,这个指数上,动量效应是超过反转效应的。 结论4 结合上面结论还能发现,进入300的股票是历史业绩最优秀的,因为now300是跑赢最多的。