{"id":689,"date":"2023-07-29T02:19:30","date_gmt":"2023-07-29T02:19:30","guid":{"rendered":"https:\/\/statorials.org\/cn\/%e5%8d%a1%e7%89%87%e8%ae%a1%e7%ae%97%e5%99%a8\/"},"modified":"2023-07-29T02:19:30","modified_gmt":"2023-07-29T02:19:30","slug":"%e5%8d%a1%e7%89%87%e8%ae%a1%e7%ae%97%e5%99%a8","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/%e5%8d%a1%e7%89%87%e8%ae%a1%e7%ae%97%e5%99%a8\/","title":{"rendered":"Mape\u8ba1\u7b97\u5668"},"content":{"rendered":"<p><script src=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/mathjs\/5.1.1\/math.js\"><\/script><script src=\"https:\/\/cdn.jsdelivr.net\/npm\/jstat@latest\/dist\/jstat.min.js\"><\/script><\/p>\n<style>\n@import url('https:\/\/fonts.googleapis.com\/css?family=Droid+Serif|Raleway');<\/p>\n<p>h1 {\ntext-align: center;\nfont-size: 50px;\nmargin-bottom: 0px;\nfont-family: 'Raleway', serif;\n}<\/p>\n<p>p {\ncolor: black;\ntext-align: center;\nmargin-bottom: 15px;\nmargin-top: 15px;\nfont-family: 'Raleway', 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{\n\ttext-align: center;\n}<\/p>\n<p>#text_area_input {\n\tpadding-left: 35%;\n\tfloat: left;\n}<\/p>\n<p>svg:not(:root) {\n  overflow: visible;\n}<\/p>\n<\/style>\n<div id=\"words\">\n<p style=\"text-align: left\"><b>\u5e73\u5747\u7edd\u5bf9\u767e\u5206\u6bd4\u8bef\u5dee (MAPE)<\/b>\u662f\u4e00\u4e2a\u6307\u6807\uff0c\u5b83\u544a\u8bc9\u6211\u4eec\u5728\u56de\u5f52\u5206\u6790\u4e2d\u9884\u6d4b\u503c\u4e0e\u89c2\u6d4b\u503c\u7684\u5e73\u5747\u5dee\u8ddd\u6709\u591a\u5927\u3002\u8ba1\u7b97\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n<p style=\"text-align: left\"> <b>MAPE<\/b> = (1\/n) * \u03a3(|O <sub>i<\/sub> \u2013 <sub>Pi<\/sub> |\/O <sub>i<\/sub> * 100<\/p>\n<p style=\"text-align: left\">\u91d1\u5b50\uff1a<\/p>\n<ul>\n<li> \u03a3 \u662f\u4e00\u4e2a\u5947\u7279\u7684\u7b26\u53f7\uff0c\u610f\u601d\u662f\u201c\u548c\u201d<\/li>\n<li> P <sub>i<\/sub>\u662f<sup>\u7b2c i \u4e2a<\/sup>\u89c2\u6d4b\u503c\u7684\u9884\u6d4b\u503c<\/li>\n<li>O <sub>i<\/sub>\u662f<sup>\u7b2c i \u4e2a<\/sup>\u89c2\u6d4b\u503c\u7684\u89c2\u6d4b\u503c<\/li>\n<li>n \u662f\u6837\u672c\u91cf<\/li>\n<\/ul>\n<p style=\"text-align: left\">\u8981\u67e5\u627e\u56de\u5f52\u7684 MAPE\uff0c\u53ea\u9700\u5728\u4e0b\u9762\u7684\u4e24\u4e2a\u6846\u4e2d\u8f93\u5165\u89c2\u6d4b\u503c\u548c\u9884\u6d4b\u503c\u7684\u5217\u8868\uff0c\u7136\u540e\u5355\u51fb\u201c\u8ba1\u7b97\u201d\u6309\u94ae\uff1a<\/p>\n<\/div>\n<p style=\"text-align: center\"><b>\u89c2\u5bdf\u503c\uff1a<\/b><\/p>\n<div id=\"words_table\"><textarea id=\"input_data_obs\" name=\"x\" rows=\"5\" cols=\"40\"> 34, 37, 44, 47, 48, 48, 46, 43, 32, 27, 26, 24<\/textarea><\/div>\n<p style=\"text-align: center\"><b>\u9884\u6d4b\u503c\uff1a<\/b><\/p>\n<div id=\"words_table\"><textarea id=\"input_data_pred\" name=\"x\" rows=\"5\" cols=\"40\"> 37, 40, 46, 44, 46, 50, 45, 44, 34, 30, 22, 23 <\/textarea><\/div>\n<div id=\"words_table\"><input type=\"button\" id=\"button\" onclick=\"calc()\" value=\"Calculate\"><\/div>\n<div id=\"words_table\">\n<p style=\"text-align: center\"> <b>MAPE = <span id=\"RMSE\">2.43242<\/span> %<\/b><\/p>\n<\/div>\n<div id=\"words_table\">\n<p style=\"text-align: center\"><span id=\"error_msg\"><\/span><\/p>\n<\/div>\n<p><script><\/p>\n<p>function calc() {<\/p>\n<p>var obs = document.getElementById('input_data_obs').value.split(',').map(Number);<\/p>\n<p>var pred = document.getElementById('input_data_pred').value.split(',').map(Number);<\/p>\n<p>\/\/check that both lists are equal length\nif (obs.length - pred.length == 0) {\ndocument.getElementById('error_msg').innerHTML = '';\n\/\/calculate RMSE\nlet error = 0\n\tfor (let i = 0; i < obs.length; i++) {\n\t\terror += Math.abs(obs[i] - pred[i]) \/ obs[i]\n\t}\n\nvar RMSE = error \/ obs.length * 100;\ndocument.getElementById('RMSE').innerHTML = RMSE.toFixed(5);\n}\n\nelse {\n document.getElementById('RMSE').innerHTML = '';\n document.getElementById('error_msg').innerHTML = 'The two lists must be of equal length.';\n}\n\t  \n} 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