{"id":311,"date":"2017-08-08T19:51:30","date_gmt":"2017-08-08T11:51:30","guid":{"rendered":"http:\/\/www.tastestars.com\/?p=311"},"modified":"2017-08-08T19:55:07","modified_gmt":"2017-08-08T11:55:07","slug":"311","status":"publish","type":"post","link":"https:\/\/tastestars.com\/index.php\/2017\/08\/08\/311\/","title":{"rendered":"Matlab\u6a21\u5f0f\u8bc6\u522b\u5de5\u5177\u7bb1"},"content":{"rendered":"

\u4e3a\u4ec0\u4e48\u6a21\u5f0f\u8bc6\u522b\uff1f
\n\u4fbf\u4e8e\u9762\u5bf9\u6210\u5343\u4e0a\u4e07\u7684\u6570\u636e\u8fdb\u884c\u5206\u7c7b\u3002
\n\u8f93\u5165\u4e3a\u5b9e\u9a8c\u6d4b\u5f97\u7684\u6570\u636ei\uff0c\u8f93\u51fa\u4e3a\u60f3\u8fdb\u884c\u5206\u7c7b\u7684\u79cd\u7c7b\uff0c\u75280\u30011\u6765\u8868\u793a\u3002\u82e5\u4e0d\u6b62\u4e24\u7c7b\uff0c\u7528\u591a\u4e2a0\u4e0e\u4e00\u4e2a1\u8868\u793a\u3002\u5982\u56db\u4e2a0001\u30010010\u30010100\u30011000.<\/p>\n

\u6a21\u5f0f\u8bc6\u522b\u8bc4\u5224\u53c2\u6570\u4e00\u822c\u7528\u4e24\u4e2a\uff1a
\nPlot confusion matrix
\nPlot ROC(receive operating characteristics)<\/p>\n

\u4ee5Training confusion matrix\u4e3a\u4f8b\u3002 <\/p>\n

\"\"
\nM\uff081\uff0c1\uff09\uff0c\u5bf9\u5e94\u5185\u542b[1000\uff0c17.1%]\u6570\u5b57\u3002\u8868\u793a\uff0c\u67091000\u4e2a\u8f93\u51fa\u4e3a1\u7c7b\u4e2d\uff0c\u88ab\u6b63\u786e\u53cd\u5e94\u4e86\u662f1\u7c7b\u3002
\nM\uff081\uff0c2\uff09\uff0c\u8868\u793a\uff1a\u5728253\u4e2a\u8f93\u51fa\u4e3a1\u7c7b\u4e2d\uff0c\u5374\u5b9e\u9645\u4e0a\u662f\u5c5e\u4e8e\u7b2c2\u7c7b\u3002
\nM\uff081\uff0c3\uff09\uff0c\u5bf9\u5e94\u5185\u542b[79.8%\uff0c20.2%]\u3002\u8868\u793a\uff0c\u5728\u8f93\u51fa\u76841\u4e2d\uff0c\u670979.8%\u88ab\u6b63\u786e\u53cd\u5e94\u4e86\u3002
\nM\uff083\uff0c1\uff09\uff0c\u5bf9\u5e94\u5185\u542b[69.5%\uff0c30.5%]\u3002\u8868\u793a\uff0c\u5b9e\u9645\u4e2d\u5c5e\u4e8e\u7b2c1\u7c7b\u7684\u4e2a\u6570\u4e2d\uff0c\u670969.5%\u7684\u4e2a\u4f53\u88ab\u6b63\u786e\u8ba4\u522b\u3002
\nM\uff083\uff0c2\uff09\uff0c\u8868\u793a\uff0c\u5b9e\u9645\u4e2d\u5c5e\u4e8e\u7b2c2\u7c7b\u7684\u4e2a\u6570\u4e2d\uff0c\u670994.3%\u7684\u4e2a\u4f53\u88ab\u6b63\u786e\u8ba4\u522b\u3002
\nM\uff083\uff0c3\uff09\uff0c\u8868\u793a\uff0c\u603b\u4f53\u4e0a\u770b\uff0c\u670988.2%\u7684\u5206\u7c7b\u4e2a\u4f53\u88ab\u8bad\u7ec3\u7684\u6a21\u578b\u6b63\u786e\u8ba4\u522b\u6216\u5206\u7c7b\u3002<\/p>\n

\u5176\u4e2dM(3\uff0c1)=M(1,1)\/[M(1,1)+M(2,1)] \u8868\u793aSensitivity\uff08\u7075\u654f\u6027\uff09\uff0c
\n\u5176\u4e2dM(3\uff0c2)=M(1,2)\/[M(1,1)+M(2,2)] \u8868\u793aSpecificity\uff08\u4e13\u4e00\u6027\uff09\uff0c
\n\u5373\u8986\u76d6\u7387\uff08\u6839\u636e\u81ea\u5df1\u9700\u6c42\u9009\u62e9M(3\uff0c1),M(3\uff0c2)\uff09
\n\u5176\u4e2dM(1\uff0c3)=M(1,1)\/[M(1,1)+M(1,2)] \u8868\u793apositive predictive value \uff0c
\n\u5176\u4e2dM(2\uff0c3)=M(2,1)\/[M(2,1)+M(2,2)] \u8868\u793aNegative predictive value\uff0c
\n\u5373\u547d\u4e2d\u7387\uff08\u6839\u636e\u81ea\u5df1\u9700\u6c42\u9009\u62e9M(1\uff0c3),M(2\uff0c3)\uff09
\n \u53ef\u4ee5\u770b\u8fd9\u7bc7\u535a\u6587\u5e2e\u52a9\u7406\u89e3\uff1ahttp:\/\/blog.csdn.net\/u010159842\/article\/details\/53083382<\/p>\n

\u51e0\u7ec4\u76f8\u5bf9\u5e94\u7684\u6982\u5ff5\uff1a
\n1. sensitivity vs. specificity
\n2. recall vs. precision
\n3. accuracy vs. error rate
\n4. type I error vs. type II error
\n5. \u9488\u5bf9precision\u548crecall\u6709F1\u6307\u6807\uff0c\u7528\u4e8e\u5b9e\u73b0\u4e24\u8005\u4e4b\u95f4\u7684tradeoff\u3002<\/p>\n

\u53e6\u4e00\u4e2a\u5224\u65ad\u6807\u51c6\u4e3aROC
\n\"\"
\n\u6a2a\u8f74\u4e3a\u9519\u8bef\u51b3\u5b9a\uff0c\u7eb5\u8f74\u4e3a\u6b63\u786e\u51b3\u5b9a\u3002\u8d8a\u9760\u8fd1\u5de6\u4e0a\u65b9\uff080\uff0c1\uff09\u8d8a\u597d<\/p>\n

\u987a\u4fbf\u8865\u5145\u4e00\u4e0b\u6a21\u5f0f\u8bc6\u522b\u548c\u6a21\u5f0f\u5206\u7c7b\u7684\u533a\u522b\uff1a
\n\u6a21\u5f0f\u8bc6\u522b\uff1a\u60f3\u8c61\u4e0b\u516c\u56ed\u7684\u8349\u5730\u4e0a\u4e00\u4e2a\u5973\u5b69\u548c\u4e24\u53ea\u72d7\u73a9\u3002\uff0c\u8f93\u51fa\u90a3\u4e2a\u4f4d\u7f6e\uff0c\u4ec0\u4e48\u7269\u79cd\u3002
\n\u6a21\u5f0f\u5206\u7c7b\uff1a\u8f93\u5165\u4e00\u5f20\u7167\u7247\uff0c\u8f93\u51fa\u662f\u4e0d\u662f\u4eba\uff0c\u662f\u4e0d\u662f\u72d7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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