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1、题目难度浅析(Topicdifficultyanalysis)TopicdifficultyanalysisYurenshengItemdifficultyisanimportantindextoreflectthecharacteristicsoftestquestions・Titledifficulty,asitsnamesuggests,isthedegreeofdifficultyofthesubject,theindexthatreflectsthedegreeofdifficultyofthesubject・Itiscalledthedegreeofdifficultyofth
2、esubject,sometimesreferredtoasthedifficultyofthesubject.Accordingtothemeasurementtheory,methodofcalculatingcoefficientofdifficultyisalsodifferent,thedifficultycoefficientofourcommonmainsubjectofcorrectanswerrate,thedifficultyandusingitemresponsetheorytoestimatethedifficulty.1.theconceptofdifficult
3、yinclassicalmeasurementtheory(CTT)Theeaseofthesubjectvariesfrompersontoperson.Asimpleexampleis:1+1=?.Forallpeopleabovetheprimarylevel,thecorrectanswerisself-evident,butitisdifficultforababywhoisnotknowntothenumbers・Anyquestioniseasyforanexpertinthefield,andaproblemforanoutsider.Thisshowsthatthedeg
4、reeofdifficultyisrelativeratherthanabsolute.Theclassicalmeasurementtheoryisdefinedasthedifficultyorthecorrectanswerratethroughthequestionscoringrateorthecorrectanswerrate,alsoknownasthecorrectanswerrateofthetopic・Everytimeafterexamination,inordertounderstandtheresponseofthecandidatesontheitem,then
5、eedforitemanalysis,whichisanimportantpartofstatisticsofeachproblemintheexaminationofhowmanycandidatesdo,howmanycandidatesdowrong,orthattheaveragescoreof.Inthisexamination,thequestionswithhigheraveragescoresareeasier,andthequestionswithloweraveragescoresaremoredifficult・Inordertocomparethedegreeofd
6、ifficultyofeachquestion,topicanalysisisusedinthesubject'sscorerateortitleanswerrateasthedifficultyfortheclassicmeasurementtheoryinthedifficultyofproblemdefinition.WeuseP+toindicatethedifficultyofthesubject,thenP+二，inwhichRistheaveragescoreoftheexamineeonthequestion,andNistheperfectscoreofthequesti
7、on・0二P+=1・TherangeofthedifficultyvalueisbetweenOT,andthegreaterthedifficultyis,thehigherthescoringrateofthetopicis,theeasiertheexaminationquestionis,andthesmallerthedifficultyvalueis,thelowerthescoreofthetopicis,
