学科分类
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4 个结果
  • 简介:TheCET4writingtestiswidelyusedinChina,butwhetheritisamorereliableandvalidtestofwritingforCET4thanothermethodsofevaluationisstillnotclear.Thepurposeofthisstudywastoexaminethereliabilityandthevalidityofamodificationofthistest.Incarryingoutthestudy,atotalof60Band4studentsinZhejiangUniversitytookthemodifiedtest,aCET4testandaFirstCertificatePracticeTest.TheresultsofthisstudydemonstratethatthemodifiedversionisasignificantlymorereliableandvalidwritingtestthanthepresentCET4writingtest.TheseresultssuggestthattheCET4writingtestneedsmodification.

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  • 简介:Dataenvelopmentanalysis(DEA)modeliswidelyusedtoevaluatetherelativeefficiencyofproducers.Itisakindofobjectivedecisionmethodwithmultipleindexes.However,thetwobasicmodelsfrequentlyusedatpresent,theC2RmodelandtheC2GS2modelhavelimitationswhenusedalone,resultinginevaluationsthatareoftenunsatisfactory.Inordertosolvethisproblem,amixedDEAmodelisbuiltandisusedtoevaluatethevalidityofthebusinessefficiencyoflistedcompanies.AnexplanationofhowtousethismixedDEAmodelisofferedanditsfeasibilityisverified.

  • 标签: DEA 决策学 管理方法 数据封套分析模型
  • 简介:TheusualF--testhasbeenusedtotestagenerallinearhypothesisforatwo--stageleastsquaresmethodinasystemofeconomicequations.However,wefindthatthisF--testisactuallyasymptoticallyinvalid.Somesuggestionsaregivenfortestingagenerallinearhypothesisinthissituation.

  • 标签: HYPOTHESIS usual ordinary PROOF 田祖 丁耳