Matrix WEKA软件对混淆矩阵的分析

*大家好，我在比较混淆矩阵时遇到了问题。下面我提供了两个混淆矩阵

  a    b      classified as
   349  58      a  tested_negative
   93   124     b  tested_positive

   a    b    classified as
   346  61    a  tested_negative
   90   127   b  tested_positive
i know that the diagonal of top-left to right but here both that value is same so how can i make decision which one best?*

---

这实际上取决于您的具体应用。 假设你想尽量减少误报的数量（因为处理任何误报的后果都会花费你很多钱）

  a    b      classified as
   349  58      a  tested_negative
   93   124     b  tested_positive

   a    b    classified as
   346  61    a  tested_negative
   90   127   b  tested_positive
i know that the diagonal of top-left to right but here both that value is same so how can i make decision which one best?*

在这种情况下，选择第一个分类器，因为其误报率低于第二个分类器：

  a    b      classified as
   349  58      a  tested_negative
   93   124     b  tested_positive

   a    b    classified as
   346  61    a  tested_negative
   90   127   b  tested_positive
i know that the diagonal of top-left to right but here both that value is same so how can i make decision which one best?*

58/（58+124）<61/（61+127） 0.3186813<0.3244681

  a    b      classified as
   349  58      a  tested_negative
   93   124     b  tested_positive

   a    b    classified as
   346  61    a  tested_negative
   90   127   b  tested_positive
i know that the diagonal of top-left to right but here both that value is same so how can i make decision which one best?*

看看这里

  a    b      classified as
   349  58      a  tested_negative
   93   124     b  tested_positive

   a    b    classified as
   346  61    a  tested_negative
   90   127   b  tested_positive
i know that the diagonal of top-left to right but here both that value is same so how can i make decision which one best?*

在这里：

  a    b      classified as
   349  58      a  tested_negative
   93   124     b  tested_positive

   a    b    classified as
   346  61    a  tested_negative
   90   127   b  tested_positive
i know that the diagonal of top-left to right but here both that value is same so how can i make decision which one best?*

如果您只是想要“最佳分类器”-您有一个问题，因为两个分类器具有相同的精度：

  a    b      classified as
   349  58      a  tested_negative
   93   124     b  tested_positive

   a    b    classified as
   346  61    a  tested_negative
   90   127   b  tested_positive
i know that the diagonal of top-left to right but here both that value is same so how can i make decision which one best?*

a1=（349+124）/（349+124+58+93）=0.7580128 a2=（346+127）/（346+127+61+90）=0.7580128

  a    b      classified as
   349  58      a  tested_negative
   93   124     b  tested_positive

   a    b    classified as
   346  61    a  tested_negative
   90   127   b  tested_positive
i know that the diagonal of top-left to right but here both that value is same so how can i make decision which one best?*

因此，您需要分析您的领域或行业，并决定是否要：

  a    b      classified as
   349  58      a  tested_negative
   93   124     b  tested_positive

   a    b    classified as
   346  61    a  tested_negative
   90   127   b  tested_positive
i know that the diagonal of top-left to right but here both that value is same so how can i make decision which one best?*

1） 获取尽可能少的误报-然后选择误报率最小的分类器

  a    b      classified as
   349  58      a  tested_negative
   93   124     b  tested_positive

   a    b    classified as
   346  61    a  tested_negative
   90   127   b  tested_positive
i know that the diagonal of top-left to right but here both that value is same so how can i make decision which one best?*

2） 获得尽可能少的漏检案例-然后选择假阴性率最小的分类器

  a    b      classified as
   349  58      a  tested_negative
   93   124     b  tested_positive

   a    b    classified as
   346  61    a  tested_negative
   90   127   b  tested_positive
i know that the diagonal of top-left to right but here both that value is same so how can i make decision which one best?*

3） 获得尽可能多的点击-然后选择具有最大真阳性率的分类器

  a    b      classified as
   349  58      a  tested_negative
   93   124     b  tested_positive

   a    b    classified as
   346  61    a  tested_negative
   90   127   b  tested_positive
i know that the diagonal of top-left to right but here both that value is same so how can i make decision which one best?*

4） 获得更多正确的拒绝-然后选择具有最大真阴性率的分类器

  a    b      classified as
   349  58      a  tested_negative
   93   124     b  tested_positive

   a    b    classified as
   346  61    a  tested_negative
   90   127   b  tested_positive
i know that the diagonal of top-left to right but here both that value is same so how can i make decision which one best?*