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1、MATAREFERENCEMANUALRELEASE13®AStataPressPublicationStataCorpLPCollegeStation,Texas®Copyrightc1985–2013StataCorpLPAllrightsreservedVersion13PublishedbyStataPress,4905LakewayDrive,CollegeStation,Texas77845TypesetinTEXISBN-10:1-59718-130-7ISBN-13:978-1-59718-130-3Thisman
2、ualisprotectedbycopyright.Allrightsarereserved.Nopartofthismanualmaybereproduced,storedinaretrievalsystem,ortranscribed,inanyformorbyanymeans—electronic,mechanical,photocopy,recording,orotherwise—withoutthepriorwrittenpermissionofStataCorpLPunlesspermittedsubjecttothe
3、termsandconditionsofalicensegrantedtoyoubyStataCorpLPtousethesoftwareanddocumentation.Nolicense,expressorimplied,byestoppelorotherwise,toanyintellectualpropertyrightsisgrantedbythisdocument.StataCorpprovidesthismanual“asis”withoutwarrantyofanykind,eitherexpressedorimp
4、lied,including,butnotlimitedto,theimpliedwarrantiesofmerchantabilityandfitnessforaparticularpurpose.StataCorpmaymakeimprovementsand/orchangesintheproduct(s)andtheprogram(s)describedinthismanualatanytimeandwithoutnotice.Thesoftwaredescribedinthismanualisfurnishedunderal
5、icenseagreementornondisclosureagreement.Thesoftwaremaybecopiedonlyinaccordancewiththetermsoftheagreement.ItisagainstthelawtocopythesoftwareontoDVD,CD,disk,diskette,tape,oranyothermediumforanypurposeotherthanbackuporarchivalpurposes.Theautomobiledatasetappearingontheac
6、companyingmediaisCopyrightc1979byConsumersUnionofU.S.,Inc.,Yonkers,NY10703-1057andisreproducedbypermissionfromCONSUMERREPORTS,April1979.Stata,,StataPress,Mata,,andNetCourseareregisteredtrademarksofStataCorpLP.StataandStataPressareregisteredtrademarkswiththeWorldIntell
7、ectualPropertyOrganizationoftheUnitedNations.NetCourseNowisatrademarkofStataCorpLP.Otherbrandandproductnamesareregisteredtrademarksortrademarksoftheirrespectivecompanies.Forcopyrightinformationaboutthesoftware,typehelpcopyrightwithinStata.Thesuggestedcitationforthisso
8、ftwareisStataCorp.2013.Stata:Release13.StatisticalSoftware.CollegeStation,TX:StataCorpLP.Briefcontents[M-0]Introductiontothe
