我使用R中平滑樣條函數,但我得到一個警告消息說:在R中的平滑樣條中,'具有非唯一'x'值的交叉驗證意味着什麼似乎令人懷疑'?
> boneMaleSmooth = smooth.spline(bone[males,"age"], bone[males,"spnbmd"], cv=TRUE)
Warning message:
In smooth.spline(bone[males, "age"], bone[males, "spnbmd"], cv = TRUE) :
cross-validation with non-unique 'x' values seems doubtful
> boneFemaleSmooth = smooth.spline(bone[females,"age"], bone[females,"spnbmd"], cv=TRUE)
Warning message:
In smooth.spline(bone[females, "age"], bone[females, "spnbmd"], :
cross-validation with non-unique 'x' values seems doubtful
我讀它的地方,說這沒有多大意義。但我不確定是什麼造成的。希望可以有人幫幫我。