{"id":14598,"date":"2025-08-12T22:41:13","date_gmt":"2025-08-12T14:41:13","guid":{"rendered":"https:\/\/blog.roboadvisor.com.tw\/?p=14598"},"modified":"2026-05-02T10:38:19","modified_gmt":"2026-05-02T02:38:19","slug":"%e5%9c%a8%e5%9b%a0%e5%ad%90%e6%8a%95%e8%b3%87%e4%b8%ad%ef%bc%8c%e7%82%ba%e4%bd%95%e3%80%8c%e5%a4%9a%e3%80%8d%e4%b8%8d%e4%b8%80%e5%ae%9a%e7%ad%89%e6%96%bc%e3%80%8c%e5%a5%bd%e3%80%8d%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/blog.roboadvisor.com.tw\/?p=14598","title":{"rendered":"\u5728\u56e0\u5b50\u6295\u8cc7\u4e2d\uff0c\u70ba\u4f55\u300c\u591a\u300d\u4e0d\u4e00\u5b9a\u7b49\u65bc\u300c\u597d\u300d\uff1f"},"content":{"rendered":"\n<p>\u5728\u5efa\u7acb\u6295\u8cc7\u7d44\u5408\u6642\uff0c\u8a31\u591a\u4eba\u53ef\u80fd\u6703\u9677\u5165\u300c\u8d8a\u591a\u8d8a\u597d\u300d\u7684\u8ff7\u601d\uff0c\u8a8d\u70ba\u7d0d\u5165\u7684\u56e0\u5b50\u8d8a\u591a\uff0c\u6a21\u578b\u5c31\u8d8a\u5f37\u5927\u3002\u7136\u800c\uff0c\u5f9e\u7d71\u8a08\u5b78\u7684\u89d2\u5ea6\u4f86\u770b\uff0c\u9019\u7a2e\u60f3\u6cd5\u5b58\u5728\u98a8\u96aa\uff0c\u904e\u591a\u7684\u56e0\u5b50\u53ef\u80fd\u5c0e\u81f4\u6a21\u578b\u904e\u5ea6\u64ec\u5408\uff08overfitting\uff09\uff0c\u53cd\u800c\u964d\u4f4e\u4e86\u9810\u6e2c\u7684\u6e96\u78ba\u6027\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>R\u00b2 \u8207\u8abf\u6574\u5f8c R\u00b2 \u7684\u555f\u793a<\/strong><\/h2>\n\n\n\n<p>\u5728\u8a55\u4f30\u8ff4\u6b78\u6a21\u578b\u7684\u64ec\u5408\u5ea6\u6642\uff0cR\u00b2\uff08\u6c7a\u5b9a\u4fc2\u6578\uff09\u662f\u4e00\u500b\u5e38\u898b\u7684\u6307\u6a19\uff0c\u5b83\u8861\u91cf\u7684\u662f\u56e0\u8b8a\u6578\u7684\u7e3d\u8b8a\u7570\u4e2d\u53ef\u7531\u81ea\u8b8a\u6578\u89e3\u91cb\u7684\u767e\u5206\u6bd4\u3002\u7136\u800c\uff0cR\u00b2 \u6709\u4e00\u500b\u986f\u8457\u7684\u7f3a\u9ede\uff1a\u6bcf\u7576\u5728\u6a21\u578b\u4e2d\u52a0\u5165\u65b0\u7684\u81ea\u8b8a\u6578\uff0c\u7121\u8ad6\u5176\u662f\u5426\u771f\u7684\u91cd\u8981\uff0cR\u00b2 \u7684\u503c\u90fd\u53ea\u6703\u589e\u52a0\u6216\u7dad\u6301\u4e0d\u8b8a\uff0c\u9019\u6703\u8aa4\u5c0e\u6211\u5011\u8a8d\u70ba\u6a21\u578b\u8b8a\u5f97\u66f4\u597d\u4e86\u3002 <\/p>\n\n\n\n<p>\u70ba\u4e86\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff0c\u7d71\u8a08\u5b78\u5bb6\u63d0\u51fa\u4e86\u300c\u8abf\u6574\u5f8c R\u00b2\u300d\uff08adjusted R\u00b2\uff09\u3002\u8207 R\u00b2 \u4e0d\u540c\uff0c\u8abf\u6574\u5f8c R\u00b2 \u6703\u5c0d\u65b0\u589e\u7684\u81ea\u8b8a\u6578\u9032\u884c\u61f2\u7f70\u3002\u53ea\u6709\u7576\u65b0\u52a0\u5165\u7684\u8b8a\u6578\u5c0d\u6a21\u578b\u7684\u89e3\u91cb\u529b\u9054\u5230\u4e00\u5b9a\u9580\u6abb\u6642\uff08\u901a\u5e38\u662f\u5176 t \u7d71\u8a08\u91cf\u7684\u7d55\u5c0d\u503c\u5927\u65bc 1\uff09\uff0c\u8abf\u6574\u5f8c R\u00b2 \u7684\u503c\u624d\u6703\u589e\u52a0\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u52a0\u5165\u89e3\u91cb\u529b\u4e0d\u8db3\u7684\u8b8a\u6578\uff0c\u53cd\u800c\u6703\u5c0e\u81f4\u8abf\u6574\u5f8c R\u00b2 \u4e0b\u964d\u3002 \u56e0\u6b64\uff0c\u8abf\u6574\u5f8c R\u00b2 \u6210\u70ba\u4e00\u500b\u66f4\u53ef\u9760\u7684\u6307\u6a19\uff0c\u5e6b\u52a9\u6211\u5011\u5224\u65b7\u662f\u5426\u61c9\u5c07\u65b0\u56e0\u5b50\u7d0d\u5165\u6a21\u578b\uff0c\u907f\u514d\u53ea\u56e0\u56e0\u5b50\u6578\u91cf\u589e\u52a0\u800c\u76f2\u76ee\u6a02\u89c0\u3002 <\/p>\n\n\n\n<h2 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