We introduce the futures return vector to replace the single future return, deduce the multiple futures to single cash hedge model to realize the dispersion of basis risk.

引入多个期货合约收益率向量代替单个合约的收益率，推导出多种期货合约对一种现货进行套期保值模型，解决了交叉套期保值的基差风险分散问题。

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The dispersion is somewhat larger when measuring average annual returns (annualized return, recall, is the compounded or geometric rate of return during a multiple-year time period).

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