锘??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#22269;&#20135;&#31934;&#21697;&#20037;&#20037;&#20037;&#20037;&#20037;&#20037;&#20037;&#20037;&#107;&#116;&#118;&#44;&#22269;&#20135;&#31532;&#19968;&#39029;&#22312;&#32447;&#35270;&#39057;&#44;&#20037;&#20037;&#25104;&#20154;&#39640;&#28165;</title><link>http://www.aygfsteel.com/juliashine/category/18282.html</link><description /><language>zh-cn</language><lastBuildDate>Wed, 28 Feb 2007 07:48:49 GMT</lastBuildDate><pubDate>Wed, 28 Feb 2007 07:48:49 GMT</pubDate><ttl>60</ttl><item><title>鏁版嵁鎸栨帢瀛︿範絎旇涔?Classification妯″瀷閫夋嫨 (涓�)  ROC </title><link>http://www.aygfsteel.com/juliashine/archive/2006/12/12/87246.html</link><dc:creator>Juliashine</dc:creator><author>Juliashine</author><pubDate>Tue, 12 Dec 2006 06:25:00 GMT</pubDate><guid>http://www.aygfsteel.com/juliashine/archive/2006/12/12/87246.html</guid><wfw:comment>http://www.aygfsteel.com/juliashine/comments/87246.html</wfw:comment><comments>http://www.aygfsteel.com/juliashine/archive/2006/12/12/87246.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/juliashine/comments/commentRss/87246.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/juliashine/services/trackbacks/87246.html</trackback:ping><description><![CDATA[ROC鏇茬嚎錛圧eceiver Operating Characteeristic Curve錛夋槸鏄劇ずClassification妯″瀷鐪熸鐜囧拰鍋囨鐜囦箣闂存姌涓殑涓�縐嶅浘褰㈠寲鏂規硶銆?br /><br />瑙ｈROC鍥劇殑涓�浜涙蹇靛畾涔?錛?br /><br />鐪熸錛圱rue Positive , TP錛夎妯″瀷棰勬祴涓烘鐨勬鏍鋒湰<br />鍋囪礋錛團alse Negative , FN錛夎妯″瀷棰勬祴涓鴻礋鐨勬鏍鋒湰<br />鍋囨錛團alse Positive , FP錛夎妯″瀷棰勬祴涓烘鐨勮礋鏍鋒湰<br />鐪熻礋錛圱rue Negative , TN錛夎妯″瀷棰勬祴涓鴻礋鐨勮礋鏍鋒湰 <br /><br />鐪熸鐜囷紙True Positive Rate , TPR錛夋垨鐏墊晱搴︼紙sensitivity錛壜?br />聽聽聽TPR = TP /錛圱P + FN錛壜?br />聽聽聽姝ｆ牱鏈嫻嬬粨鏋滄暟 / 姝ｆ牱鏈疄闄呮暟 <br />鍋囪礋鐜囷紙False Negative Rate , FNR錛壜?br />聽聽聽FNR = FN /錛圱P + FN錛壜?br />聽聽聽琚嫻嬩負璐熺殑姝ｆ牱鏈粨鏋滄暟 / 姝ｆ牱鏈疄闄呮暟<br />鍋囨鐜囷紙False Positive Rate , FPR錛壜?br />聽聽聽FPR = FP /錛團P + TN錛壜?br />聽聽聽琚嫻嬩負姝ｇ殑璐熸牱鏈粨鏋滄暟 /璐熸牱鏈疄闄呮暟 <br />鐪熻礋鐜囷紙True Negative Rate , TNR錛夋垨鐗規寚搴︼紙specificity錛壜?br />聽聽聽TNR = TN /錛圱N + FP錛壜?br />聽聽聽璐熸牱鏈嫻嬬粨鏋滄暟 / 璐熸牱鏈疄闄呮暟 <br /><br />鐩爣灞炴�х殑琚�変腑鐨勯偅涓湡鏈涘�肩О浣滄槸鈥滄鈥濓紙positive錛?br /><br />ROC鏇茬嚎涓婂嚑涓叧閿偣鐨勮В閲婏細<br /><br />( TPR=0,FPR=0 ) 鎶婃瘡涓疄渚嬮兘棰勬祴涓鴻礋綾葷殑妯″瀷<br />( TPR=1,FPR=1 ) 鎶婃瘡涓疄渚嬮兘棰勬祴涓烘綾葷殑妯″瀷<br />( TPR=1,FPR=0 ) 鐞嗘兂妯″瀷<br /><br /><em><font color="#ff0000">姝ゅ鍥懼儚浠ュ悗鍐嶈ˉ<br /></font><br /></em>涓�涓ソ鐨勫垎綾繪ā鍨嬪簲璇ュ敖鍙兘闈犺繎鍥懼艦鐨勫乏涓婅錛岃�屼竴涓殢鏈虹寽嫻嬫ā鍨嬪簲浣嶄簬榪炴帴鐐癸紙TPR=0,FPR=0錛夊拰錛圱PR=1,FPR=1錛夌殑涓誨瑙掔嚎涓娿�?br /><br />ROC鏇茬嚎涓嬫柟鐨勯潰縐紙AUC錛夋彁渚涗簡璇勪環妯″瀷騫沖潎鎬ц兘鐨勫彟涓�縐嶆柟娉曘�傚鏋滄ā鍨嬫槸瀹岀編鐨勶紝閭ｄ箞瀹冪殑AUG = 1錛屽鏋滄ā鍨嬫槸涓畝鍗曠殑闅忔満鐚滄祴妯″瀷錛岄偅涔堝畠鐨凙UG = 0.5錛屽鏋滀竴涓ā鍨嬪ソ浜庡彟涓�涓紝鍒欏畠鐨勬洸綰夸笅鏂歸潰縐浉瀵硅緝澶с�?br /><br /><div style="BORDER-RIGHT: #cccccc 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #cccccc 1px solid; PADDING-LEFT: 4px; FONT-SIZE: 13px; PADDING-BOTTOM: 4px; BORDER-LEFT: #cccccc 1px solid; WIDTH: 98%; WORD-BREAK: break-all; PADDING-TOP: 4px; BORDER-BOTTOM: #cccccc 1px solid; BACKGROUND-COLOR: #eeeeee"><img id="Code_Closed_Image_143317" onclick="this.style.display='none'; Code_Closed_Text_143317.style.display='none'; Code_Open_Image_143317.style.display='inline'; Code_Open_Text_143317.style.display='inline';" height="16" src="http://www.aygfsteel.com/images/OutliningIndicators/ContractedBlock.gif" width="11" align="top" /><img id="Code_Open_Image_143317" style="DISPLAY: none" onclick="this.style.display='none'; Code_Open_Text_143317.style.display='none'; Code_Closed_Image_143317.style.display='inline'; Code_Closed_Text_143317.style.display='inline';" height="16" src="http://www.aygfsteel.com/images/OutliningIndicators/ExpandedBlockStart.gif" width="11" align="top" /><span id="Code_Closed_Text_143317" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">Oracle 璁哄潧涓婂ROC 鐨勮В閲?/span><span id="Code_Open_Text_143317" style="DISPLAY: none"><br /><!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>--><font size="3"><span style="COLOR: #000000">This聽explaination聽comes聽from聽one聽of聽our聽algorithm聽engineers:聽<br /><br /></span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">The聽ROC聽analysis聽applies聽to聽binary聽classification聽problems.聽One聽of聽the聽classes聽is聽selected聽as聽a聽</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">positive</span><span style="COLOR: #000000">"</span></font><span style="COLOR: #000000"><font size="3">聽one.聽The聽ROC聽chart聽plots聽the聽true聽positive聽rate聽as聽a聽function聽of聽the聽false聽positive聽rate.聽It聽is聽parametrized聽by聽the聽probability聽threshold聽values.聽The聽true聽positive聽rate聽represents聽the聽fraction聽of聽positive聽cases聽that聽were聽correctly聽classified聽by聽the聽model.聽The聽false聽positive聽rate聽represents聽the聽fraction聽of聽negative聽cases聽that聽were聽incorrectly聽classified聽as聽positive.聽Each聽point聽on聽the聽ROC聽plot聽represents聽a聽true_positive_rate/false_positive_rate聽pair聽corresponding聽to聽a聽particular聽probability聽threshold.聽Each聽point聽has聽a聽corresponding聽confusion聽matrix.聽The聽user聽can聽analyze聽the聽confusion聽matrices聽produced聽at聽different聽threshold聽levels聽and聽select聽a聽probability聽threshold聽to聽be聽used聽for聽scoring.聽The聽probability聽threshold聽choice聽is聽usually聽based聽on聽application聽requirements聽(i.e.,聽acceptable聽level聽of聽false聽positives).<br /></font></span><span style="COLOR: #000000"><br /></span><font size="3"><span style="COLOR: #000000">The聽ROC聽does聽not聽represent聽a聽model.聽Instead聽it聽quantifies聽its聽discriminatory聽ability聽and聽assists聽the聽user聽in聽selecting聽an聽appropriate聽operating聽point聽</span><span style="COLOR: #0000ff"><font color="#000000">for</font></span><span style="COLOR: #000000">聽scoring.</span></font><span style="COLOR: #000000"><font size="3">"<br /></font></span><span style="COLOR: #000000"><br /><font size="3">I聽would聽add聽to聽</font></span><font size="3"><span style="COLOR: #0000ff"><font color="#000000">this</font></span><span style="COLOR: #000000">聽that聽you聽can聽select聽a聽threshold聽point聽the聽build聽activity聽to聽bias聽the聽apply聽process.聽Currently聽we聽generate聽a聽cost聽matrix聽based聽on聽the聽selected聽threshold聽point聽rather聽than聽use聽the聽threshold聽point聽directly.</span></font></span></div><a >http://forums.oracle.com/forums/thread.jspa?threadID=415870&amp;tstart=15</a><img src ="http://www.aygfsteel.com/juliashine/aggbug/87246.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/juliashine/" target="_blank">Juliashine</a> 2006-12-12 14:25 <a href="http://www.aygfsteel.com/juliashine/archive/2006/12/12/87246.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item></channel></rss>                  <footer>
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