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[求助] 如何使用n+1算法计算ROA

最近在看计算ROA的论文,发现很多作者都说他们使用了n+1算法,引用文献如下:
http://onlinelibrary.wiley.com/doi/10.1002/chir.20777/abstract;jsessionid=14C3AD799579FB6EA0E723D8AD44458D.f02t04
而且作者们也是使用高斯算的ROA,但是翻找高斯的用户手册并没有发现相应的介绍。
有谁知道如何在高斯上使用这种算法,帮忙指点一二,谢谢。
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