{"id":394,"date":"2017-02-06T01:01:36","date_gmt":"2017-02-05T17:01:36","guid":{"rendered":"https:\/\/www.beneplot.com\/?p=394"},"modified":"2020-07-23T15:09:36","modified_gmt":"2020-07-23T07:09:36","slug":"%e9%9a%be%e5%ba%a6%e5%8f%82%e6%95%b0difficulty-parameter%e3%80%81%e4%bd%8d%e7%bd%ae%e5%8f%82%e6%95%b0category-parameter%ef%bc%8c%e6%ad%a5%e9%aa%a4%e5%8f%82%e6%95%b0step-parameter%e3%80%81","status":"publish","type":"post","link":"https:\/\/www.beneplot.com\/?p=394","title":{"rendered":"\u9879\u76ee\u53cd\u5e94\u7406\u8bba\u4e2d\u96be\u5ea6\u53c2\u6570\u3001\u4f4d\u7f6e\u53c2\u6570\uff0c\u6b65\u9aa4\u53c2\u6570\u3001\u9608\u503c\u7684\u5f02\u540c"},"content":{"rendered":"<p>\u5728IRT\u5206\u6790\u4e2d\uff0c<strong>\u96be\u5ea6\u53c2\u6570(Difficulty Parameter\uff0c\ud835\udeff)<\/strong>\u3001<strong>\u4f4d\u7f6e\u53c2\u6570(Category Parameter\uff0c\ud835\udeff<sub>\ud835\udc58<\/sub>)<\/strong>\uff0c<strong>\u6b65\u9aa4\u53c2\u6570(Step Parameter\uff0c\ud835\udf0f<sub>\ud835\udc58<\/sub>)<\/strong>\u3001<strong>\u9608\u503c(Thurstonian Threshold\uff0c\u03b3)<\/strong>\u662f\u56db\u4e2a\u5bb9\u6613\u6df7\u6dc6\u7684\u53c2\u6570\u503c\uff0c\u56e0\u4e3a\u5728\u4e0d\u540c\u7684\u60c5\u5f62\u4e0b\uff0c\u7814\u7a76\u8005\u4eec\u4f1a\u9009\u62e9\u91c7\u7528\u5b83\u4eec\u4e2d\u7684\u4e00\u4e2a\u6216\u591a\u4e2a\u6765\u4f5c\u4e3a<strong>\u9879\u76ee\u96be\u5ea6\u503c(Item Difficulty)\uff0c<\/strong>\u672c\u6587\u5c06\u5bf9\u6bd4\u8fd9\u4e9b\u53c2\u6570\u7684\u5f02\u540c\u3002<\/p>\n<p><span style=\"font-size: 1rem;\">\u5728\u4f7f\u7528<strong><span style=\"color: #000000;\"><a style=\"color: #000000;\" title=\"\u4e0d\u540c\u591a\u7ea7IRT\u6a21\u578b (Polytomous IRT Models) \u7684\u533a\u522b\" href=\"https:\/\/www.beneplot.com\/?p=382\" target=\"_blank\" rel=\"nofollow noopener sponsored ugc noreferrer\">\u5206\u90e8\u8bc4\u5206\u6a21\u578b(Partial Credit Model\uff0cPCM)<\/a><\/span><\/strong>\u8fdb\u884c\u5206\u6790\u65f6\uff0c<\/span>\u5bf9<strong>0\uff0c1\uff0c2\u8ba1\u5206\u7684\u9898\u76ee<\/strong>\u6765\u8bf4\uff0c\u5173\u7cfb\u5982\u4e0b\u56fe\uff1a<\/p>\n<p><img src=\" https:\/\/www.beneplot.com\/?attachment_id=395\" alt=\"\" \/><\/p>\n<p>\u5728\u4f7f\u7528\u4e13\u4e1a\u8f6f\u4ef6\u8fdb\u884c\u5206\u6790\u540e\uff0c\u6839\u636e\u4e0a\u56fe\u7684\u7ed3\u679c\u53cd\u9988\u901a\u5e38\u5982\u4e0b\uff1a<\/p>\n<p><strong>\u6b65\u9aa4\u53c2\u65701 (\ud835\udf0f<sub>1<\/sub>)<\/strong> \u4f1a\u7528<strong>Step1<\/strong> \u8868\u793a\uff0c<strong>\u6b65\u9aa4\u53c2\u65702 (\ud835\udf0f<sub>2<\/sub>)<\/strong> \u4f1a\u7528<strong>Step2<\/strong> \u8868\u793a\u3002<\/p>\n<p>\u6709\u4e9b\u8f6f\u4ef6\u5bf9<strong>0\uff0c1\uff0c2\u8ba1\u5206\u7684\u9898\u76ee<\/strong>\u4ec5\u53cd\u9988Step1\uff0c\u56e0\u4e3a\uff0c<strong>Step1 = &#8211; Step2\u3002<\/strong><\/p>\n<p>\u5bf9<strong>0\uff0c1\uff0c2\uff0c3\u8ba1\u5206\u7684\u9898\u76ee<\/strong>\u4ec5\u53cd\u9988Step1\u548cStep2\uff0c\u56e0\u4e3a\uff0c<strong>Step1 + Step2 = &#8211; Step3\u3002<\/strong><\/p>\n<p><strong>\u4f4d\u7f6e\u53c2\u65701 (\ud835\udeff<sub>1<\/sub>)<\/strong> \u901a\u5e38\u7528<strong>Cat1<\/strong> \u8868\u793a\uff0c<strong>\u4f4d\u7f6e\u53c2\u65702 (\ud835\udeff<sub>2<\/sub>)<\/strong> \u4f1a\u7528<strong>Cat2<\/strong> \u8868\u793a\uff0c\u9898\u76ee\u7684<strong>\u96be\u5ea6\u53c2\u6570 (\ud835\udeff)<\/strong> \u4f1a\u7528<strong>Item_D<\/strong> \u8868\u793a\uff0c<strong>Item_D\u4e3a0\u5206\u6982\u7387\u66f2\u7ebf\u4e0e2\u5206\u6982\u7387\u66f2\u7ebf\u7684\u4ea4\u70b9\u503c<\/strong>\u3002<\/p>\n<p>\u5bf9<strong>0\uff0c1\uff0c2\u8ba1\u5206\u7684\u9898\u76ee<\/strong>\u6765\u8bf4\uff1a<strong>Cat1 = Item_D + Step1\uff0c \u00a0\u00a0Cat2 = Item_D + Step2<\/strong>\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u4e0b\u56fe\u4e3a\u4e00\u4e2a<strong>0\uff0c1\uff0c2\uff0c3\uff0c4\u8ba1\u5206\u9898\u76ee<\/strong>\u7684<strong>\u7d2f\u79ef\u6982\u7387\u66f2\u7ebf\u56fe<\/strong>\uff0c<\/p>\n<p><img src=\" https:\/\/www.beneplot.com\/?attachment_id=396\" alt=\"\" \/><\/p>\n<p>\u5bf9\u4e8e<strong>0\uff0c1\uff0c2\uff0c3\uff0c4\u8ba1\u5206<\/strong>\u7684\u9898\u76ee\u6765\u8bf4\uff0c<strong>\u5206\u6790\u7ed3\u679c\u67094\u4e2a\u6b65\u9aa4\u53c2\u6570 (\ud835\udf0f<sub>\ud835\udc58<\/sub>)<\/strong>\uff0c\u5176\u4e2d\uff0c<\/p>\n<p><strong>Step1 + Step2 + Step3 = &#8211; Step4<\/strong>\uff1b<\/p>\n<p>\u6709<strong>4\u4e2a\u4f4d\u7f6e\u53c2\u6570\u503c (\ud835\udeff<sub>k<\/sub>)<\/strong> \uff0c\u5176\u4e2d\uff0c<strong>Cat4 = Item_D + Step4<\/strong><\/p>\n<p><strong>\u9898\u76ee\u96be\u5ea6(Item_D)\u4e3a0\u5206\u6982\u7387\u66f2\u7ebf\u4e0e4\u5206\u6982\u7387\u66f2\u7ebf\u7684\u4ea4\u70b9\u503c\u3002<\/strong><\/p>\n<p><span style=\"font-size: 1rem;\">\u4f9d\u7167\u4e0a\u56fe\uff0c<strong>0\uff0c1\uff0c2\uff0c3\uff0c4\u8ba1\u5206\u7684\u9898\u76ee\u8fd8<\/strong><\/span><strong>\u67094\u4e2a\u9608\u503c\uff08Thurstonian Threshold\uff0c\u03b3\uff09<\/strong>\uff0c\u5176\u4e2d\uff0c\u03b3<sub>1<\/sub> = -0.68\uff0c\u610f\u601d\u662f\uff0c<strong>\u8003\u751f\u7684\u80fd\u529b\u4e3a-0.68\u65f6\uff0c\u4f5c\u7b54\u8be5\u9898\u670950%\u7684\u6982\u7387\u53ef\u4ee5\u5f97\u52301\u5206<\/strong>\u2026\uff0c\u03b3<sub>4<\/sub> = 0.72\u7684\u610f\u601d\u662f\uff0c<strong>\u8003\u751f\u80fd\u529b\u4e3a0.72\u65f6\uff0c\u4f5c\u7b54\u8be5\u9898\u670950%\u7684\u6982\u7387\u53ef\u4ee5\u5f97\u52304\u5206(\u5373\u6ee1\u5206)<\/strong>\u3002<\/p>\n<p>\u5bf9\u4e8e0\uff0c1\u8ba1\u5206\u7684\u9898\u76ee\u6765\u8bf4\uff0c<\/p>\n<p><strong>\u9608\u503c<\/strong><strong>(<\/strong><strong>\u03b3, <\/strong><strong>\u53c8thresh1) = <\/strong><strong>\u96be<\/strong><strong>\u5ea6\u53c2\u6570(<\/strong><strong>\ud835\udeff<\/strong><strong>, <\/strong><strong>\u53c8<\/strong><strong>Item_D<\/strong><strong>) = <\/strong><strong>\u4f4d\u7f6e\u53c2\u6570<\/strong><strong>(<\/strong><strong>\ud835\udeff<sub>\ud835\udc58<\/sub><\/strong><strong>, <\/strong><strong>\u53c8Cat1)\uff0c<\/strong><\/p>\n<p><strong>\u6b65\u9aa4\u53c2\u6570<\/strong><strong>(<\/strong><strong>\ud835\udf0f<\/strong><strong>, <\/strong><strong>\u53c8step<\/strong><strong>)<\/strong><strong> = 0\u3002<\/strong><\/p>\n<p>\u7efc\u4e0a\u6240\u8ff0\uff0c\u5f53\u5bf90\uff0c1\u8ba1\u5206\u7684\u9898\u76ee\u8fdb\u884c\u5206\u6790\u65f6\uff0c\u7814\u7a76\u8005\u4eec\u8ba4\u8bc6\u7edf\u4e00\uff0c\u5373<strong>\u5c06<\/strong><strong>\u6d4b\u8bd5<\/strong><strong>\u8005\u5f97\u52301\u5206\u7684\u6982\u7387\u6b63\u597d\u8fbe\u52300.5<\/strong><strong>\u65f6<\/strong><strong>\u7684\u80fd\u529b\u503c\u4f5c<\/strong><strong>\u4e3a\u8be5\u9898<\/strong><strong>\u76ee\u7684<\/strong><strong>\u96be<\/strong><strong>\u5ea6<\/strong><strong>\u503c<\/strong>\u3002<\/p>\n<p>\u7136\u800c\uff0c\u5bf9\u4e8e<span style=\"font-size: 14px;\"><strong>\u591a\u7ea7\u8ba1\u5206\u7684\u9898\u76ee<\/strong><strong>(Polytomous item)<\/strong><\/span><span style=\"font-size: 1rem;\">\u6765\u8bf4\uff0c\u6709\u4e9b\u7814\u7a76\u8005\u504f\u5411<\/span><strong style=\"font-size: 1rem;\">\u5c06<\/strong><strong style=\"font-size: 1rem;\">0<\/strong><strong style=\"font-size: 1rem;\">\u5206\u6982\u7387\u66f2<\/strong><strong style=\"font-size: 1rem;\">\u7ebf<\/strong><strong style=\"font-size: 1rem;\">\u4e0e<\/strong><strong style=\"font-size: 1rem;\">4<\/strong><strong style=\"font-size: 1rem;\">\u5206\u6982\u7387\u66f2<\/strong><strong style=\"font-size: 1rem;\">\u7ebf<\/strong><strong style=\"font-size: 1rem;\">\u7684\u4ea4\u70b9<\/strong><strong style=\"font-size: 1rem;\">\u503c\u4f5c\u4e3a<\/strong><strong style=\"font-size: 1rem;\">\u9898<\/strong><strong style=\"font-size: 1rem;\">\u76ee\u7684<\/strong><strong style=\"font-size: 1rem;\">\u96be<\/strong><strong style=\"font-size: 1rem;\">\u5ea6<\/strong><strong style=\"font-size: 1rem;\">\u503c<\/strong><span style=\"font-size: 1rem;\">\uff0c\u5e76<\/span><strong style=\"font-size: 1rem;\">\u5c06\u4f4d\u7f6e\u53c2\u6570(<\/strong><strong style=\"font-size: 1rem;\">\ud835\udeff<sub>\ud835\udc58<\/sub><\/strong><strong style=\"font-size: 1rem;\">)<\/strong><strong style=\"font-size: 1rem;\">\u4f5c\u4e3a\u5404\u4e2a\u8bc4\u5206\u7c7b\u522b\u7684\u96be\u5ea6\u503c<\/strong><span style=\"font-size: 1rem;\">\uff1b\u53e6\u4e00\u4e9b\u7814\u7a76\u8005\u5219<\/span><strong style=\"font-size: 1rem;\">\u5c06\u9898\u76ee\u6ee1\u5206\u7684\u9608\u503c(\u03b3)\u4f5c\u4e3a\u9898<\/strong><strong style=\"font-size: 1rem;\">\u76ee<\/strong><strong style=\"font-size: 1rem;\">\u96be<\/strong><strong style=\"font-size: 1rem;\">\u5ea6<\/strong><strong style=\"font-size: 1rem;\">\u503c\uff0c\u5c06\u5404\u4e2a\u8bc4\u5206\u7c7b\u522b\u7684\u9608\u503c(\u03b3)\u4f5c\u4e3a\u5404\u4e2a\u8bc4\u5206\u7c7b\u522b\u7684\u96be\u5ea6\u503c\u3002<\/strong><\/p>\n<p>\u5fc5\u987b\u8981\u6ce8\u610f\u7684\u662f\uff1a<strong>\u5404\u4e2a\u8bc4\u5206\u7c7b\u522b\u7684\u6982\u7387\u66f2\u7ebf\u4f1a\u968f\u7740\u9879\u76ee(item)\u548c\u6837\u672c(person)\u7684\u53d8\u5316\u800c\u53d8\u5316\uff0c\u800c\u57fa\u4e8e\u4e0d\u7a33\u5b9a\u7684\u6982\u7387\u66f2\u7ebf\u7684\u4ea4\u70b9\u4e0e\u8ddd\u79bb\u786e\u5b9a\u7684\u4f4d\u7f6e\u53c2\u6570(\ud835\udeff<sub>\ud835\udc58<\/sub>)\u503c\u548c\u6b65\u9aa4\u53c2\u6570(\ud835\udf0f<sub>\ud835\udc58<\/sub>)\u503c\u540c\u6837\u4e5f\u662f\u4e0d\u7a33\u5b9a\u7684\u3002<\/strong>\u57fa\u4e8e\u6b64\uff0c<strong>\u4f7f\u7528\u745f\u65af\u987f\u9608\u503c(Thurstonian Thresholds)\u4f5c\u4e3a\u9879\u76ee\u96be\u5ea6\u4f1a\u662f\u66f4\u597d\u7684\u9009\u62e9\u3002<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728IRT\u5206\u6790\u4e2d\uff0c\u96be\u5ea6\u53c2\u6570(Difficulty Parameter\uff0c\ud835\udeff)\u3001\u4f4d\u7f6e\u53c2\u6570(Category Para [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v14.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<meta name=\"robots\" content=\"index, follow\" \/>\n<meta name=\"googlebot\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta name=\"bingbot\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.beneplot.com\/?p=394\" \/>\n<meta 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