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专业: 全球变化生态学

[求助] spss中如何做分段线性回归（ piecewise regression）已有1人参与

各位大侠帮忙了！请问大家如何在SPSS中做分段线性回归分析，还有那个分段的拐点（分裂点）是要自己判断设定，还是SPSS分析中可以直接给出分裂点信息。因为本人的数据比较多，而且是连续变量，自己判断拐点很难（估计也判断不准确），之前做了二次函数拟合，但是审稿人认为应该做分段线性回归分析，并检验是否存在分裂点（审稿意见大致如下： The authors use quadratic relationships. These should likely be replaced with broken stick (piece-wise) regression models. There is no evidence at the global scale that climatic relationships reverse themselves. A quadratic function might explain more variation than a linear relationship, but it does not mean it is appropriate. The authors also haven't shown the quadratic portion of the function to be significant.
4. The authors utilize a breakpoint at 0.5°C for some of their relationships. This needs to be independently derived. They need to run a piecewise regression model and test whether there is a breakpoint in their data, no less if it is at 0.5°C. ）

请高手指点！不胜感激！

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