多元线性回归警告

Question

我试图适应线性模型，但我面对这个警告;

> reg=lm(Data.readmitted ~., newdata)

Warning messages:

1: In model.response(mf, "numeric") :

`  using type = "numeric" with a factor response will be ignored

`2: In Ops.factor(y, z$residuals) : ‘-’ not meaningful for factors

来自我的数据集的

及其str()：

> str(newdata)


'data.frame':  94613 obs. of  4 variables:
    $ Data.race      : Factor w/ 5 levels "AfricanAmerican",..: 3 3 1 3 3 3 3 3 3 3 ...
    $ Data.gender    : Factor w/ 3 levels "Female","Male",..: 1 1 1 2 2 2 2 2 1 1 ...
    $ Data.age       : Factor w/ 10 levels "[0-10)","[10-20)",..: 1 2 3 4 5 6 7 8 9 10 ..
    $ Data.readmitted: Factor w/ 3 levels "<30",">30","NO": 3 2 3 3 3 2 3 2 3 3 ...
     - attr(*, "na.action")=Class 'omit'  Named int [1:2153] 20 21 22 55 66 88 100 112 128 178 ...
    .. ..- attr(*, "names")= chr [1:2153] "20" "21" "22" "55" ...