{"id":472,"date":"2018-09-02T22:44:37","date_gmt":"2018-09-02T13:44:37","guid":{"rendered":"https:\/\/best-biostatistics.com\/toukei-er\/entry\/gini-impurity-measures-of-decision-tree-in-machine-learning\/"},"modified":"2024-10-12T23:26:44","modified_gmt":"2024-10-12T14:26:44","slug":"gini-impurity-measures-of-decision-tree-in-machine-learning","status":"publish","type":"post","link":"https:\/\/best-biostatistics.com\/toukei-er\/entry\/gini-impurity-measures-of-decision-tree-in-machine-learning\/","title":{"rendered":"\u6a5f\u68b0\u5b66\u7fd2\u306e\u6c7a\u5b9a\u6728\u5206\u6790\u306b\u8a08\u7b97\u3055\u308c\u308b Gini \u4e0d\u7d14\u5ea6\u3068\u306f\uff1f \u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac"},"content":{"rendered":"\n

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\u8cb7\u3063\u305f\u4eba\u306f\u5168\u54e1\u5973\u6027\u3060\u3063\u305f\u3002<\/p>\n\n\n\n

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Gini \u4e0d\u7d14\u5ea6\u3092\u4eee\u60f3\u4f8b\u3067\u898b\u3066\u307f\u308b<\/h2>\n\n\n\n

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 <\/td>\u8cb7\u3063\u305f\u4eba<\/td>\u8cb7\u308f\u306a\u304b\u3063\u305f\u4eba<\/td><\/tr>
\u7537<\/td>4<\/td>7<\/td><\/tr>
\u5973<\/td>6<\/td>3<\/td><\/tr>
\u8a08<\/td>10<\/td>10<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u8cb7\u3063\u305f\u4eba\u306eGini\u4e0d\u7d14\u5ea6\uff1a<\/p>\n\n\n\n

$$ \\frac{4}{10} \\times \\frac{6}{10} + \\frac{6}{10} \\times \\frac{4}{10} = 0.48 $$<\/p>\n\n\n\n\n\n\n\n

\u8cb7\u308f\u306a\u304b\u3063\u305f\u4eba\u306eGini\u4e0d\u7d14\u5ea6\uff1a<\/p>\n\n\n\n

$$ \\frac{7}{10} \\times \\frac{3}{10} + \\frac{3}{10} \\times \\frac{7}{10} = 0.42 $$<\/p>\n\n\n\n\n\n\n\n

\u4eba\u6570\u3092\u91cd\u307f\u306b\u3057\u305f\u52a0\u91cd\u5e73\u5747\uff1a<\/p>\n\n\n\n

$$ \\frac{10}{20} \\times 0.48 + \\frac{10}{20} \\times 0.42 = 0.45 $$<\/p>\n\n\n\n\n\n\n\n


<\/strong>\u4eee\u60f3\u4f8b\uff12\uff1a\u8cb7\u3063\u305f\u4eba\u3068\u8cb7\u308f\u306a\u304b\u3063\u305f\u4eba\u5408\u8a0820\u540d\u306e\u5206\u5e03\u304c\u3082\u3057\u4e0b\u8868\u306e\u3088\u3046\u3060\u3063\u305f\u3089\uff1f<\/p>\n\n\n\n

 <\/td>\u8cb7\u3063\u305f\u4eba<\/td>\u8cb7\u308f\u306a\u304b\u3063\u305f\u4eba<\/td><\/tr>
\u7537<\/td>0<\/td>7<\/td><\/tr>
\u5973<\/td>10<\/td>3<\/td><\/tr>
\u8a08<\/td>10<\/td>10<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u8cb7\u3063\u305f\u4eba\u306eGini\u4e0d\u7d14\u5ea6\uff1a<\/p>\n\n\n\n

$$ \\frac{0}{10} \\times \\frac{10}{10} + \\frac{10}{10} \\times \\frac{0}{10} = 0 $$<\/p>\n\n\n\n\n\n\n\n

\u8cb7\u308f\u306a\u304b\u3063\u305f\u4eba\u306eGini\u4e0d\u7d14\u5ea6\uff1a<\/p>\n\n\n\n

$$ \\frac{7}{10} \\times \\frac{3}{10} + \\frac{3}{10} \\times \\frac{7}{10} = 0.42 $$<\/p>\n\n\n\n\n\n\n\n

\u4eba\u6570\u3092\u91cd\u307f\u306b\u3057\u305f\u52a0\u91cd\u5e73\u5747\uff1a<\/p>\n\n\n\n

$$ \\frac{10}{20} \\times 0 + \\frac{10}{20} \\times 0.42 = 0.21 $$<\/p>\n\n\n\n\n\n\n\n

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    \n
  • Gini\u4e0d\u7d14\u5ea6\u306f\u3001\u5c0f\u3055\u3044\u307b\u3046\u304c\u5206\u985e\u306b\u9069\u3057\u3066\u3044\u308b\u3002<\/li>\n\n\n\n
  • Gini\u4e0d\u7d14\u5ea6\u306f\u3001\u7279\u5fb4\u8981\u7d20A\u306e\u78ba\u7387\u3068A\u3067\u306a\u3044\u78ba\u7387\u3092\u304b\u3051\u5408\u308f\u305b\u30662\u500d\u3059\u308b\u3068\u3044\u3046\u8a08\u7b97\u3092\u3057\u3066\u3044\u308b\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

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