BkzssrkGMAT机考FAQ

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1、生命是永恒不断的创造，因为在它内部蕴含着过剩的精力，它不断流溢，越出时间和空间的界限，它不停地追求，以形形色色的自我表现的形式表现出来。－－泰戈尔CATFAQI’vereceivedanumberofinquiriesfromthecommunityabouttheGMATalgorithm,soIthoughtitbesttoreplyinarticleform.1.What’sanalgorithm?Analgorithm,generally,isausuallyefficientsetofwell-definedste

2、psthefollowingofwhichresultsinthesolutiontosomepre-definedproblem.InthecaseofaCATalgorithm,theproblemistoreliablyandefficientlyestimateastudent’sabilityinareasonableamountoftime.SomeCATalgorithmsseektosolvethisproblembyselectingonequestionatatime,eachsubsequentques

3、tionselectedbasedonallofthestudent’spriorresponses.Otheralgorithmslookonlyatthemostrecently-answeredquestion.Stillothersevaluateresponsestospecificgroupsofquestions.CATalgorithmsalsovarywithregardtotheexplicitcriteriatheyusetoselectthenextquestion(orsetsofquestions

4、)toadminister.Sometrytominimizetotalmeasurementerror.Otherstrytomaximizetheprecisionandaccuracyofmeasurementforeachquestionadministered.Stillotherstrytoselectquestionsthatwillmostrefinethecurrentabilityestimate.Asaconsequence,CATalgorithmscanvarygreatlyfromoneanoth

5、er,dependingonthespecificimplementationofthealgorithm,andtheintentofthealgorithmdevelopers.2.WhydoestheGMATuseanalgorithmwhenthelinearLSATseemstobeaprettydecentgaugeofproficiency?OneofthecommongoalsinusingaCATalgorithmistoreducethenumberofquestionsastudentneedstoan

6、swerinordertoestablish,toaspecifiedlevelofreliability,anestimateofthestudent’sability.CATsareoftenmoreefficientthanlineartests,andsofewerquestionsareneededtoreachadesiredlevelofreliability.TheLSATneedsover100itemstoreachthatlevel,whiletheGMATneedsfewerthan80toreach

7、acomparablelevel.3.IstheentireGMATadaptive?Almostalllarge-scalestandardizedtestscontainsomenumberof“experimental”or“pretest”questionsthatareadministeredtothestudent,butdonotcounttowardthestudent’sfinalscore.Thisissimplyawayforthetestmakerstogatherdataonthequestions

8、,inordertodeterminehowdifficulttheyareandhowwelltheydistinguishbetweenstudentsatdifferentabilitylevels.Theyalsousethedatacollectedtoidentifybadqu