return attribution
返回归因
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Moreover, considering the time varying attribution of the second moments of stock return, how to measure these two factors accurately is also a meaningful problem.
考虑到股市收益率的二阶距往往具有时变性，如何准确刻画这两个因素，也是一个有待讨论的问题。
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