关于广义相加模型中的自由度筛选的原则和方法？图片是我做的生育酚摄入与高同型半胱氨酸的GAM，从图中可以看出自由度是6.09，审稿人提出：“ For example, the alpha-tocopherol effect has dubious oscillations, which could be explained by a poor choice of degrees of freedom or an overfitting.  For example, the alpha-tocopherol effect has dubious oscillations, which could be explained by a poor choice of degrees of freedom or an overfitting. ”。这个问题我怎么处理呢？谢谢大家