stata 介绍与命令

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1、IntroductiontoStataGettingDataIntoStataTherearethreewaysofgettingdataintoStata1.directkeyboardentryusingtheStataEDITOR2.readrawdata(ASCIIfiles)directlyintoaStatadataset(Statacanimporttaborcommadelimiteddataordatainfixedcolumnformat)3.useadatatransferprogramsuchasDBMSco

2、pyorStat/Transfer(weuseStat/Transfer)whichcanconvertdatafromalmostanycommonprogram(database,spreadsheetorstatisticalpackage)intoStataandviceversaTypingCommandsvsUsingMenusvsBatchFilesTherearethreewaysthatyoucanrunStata.1.choosecommandsfromthedrop-downmenus2.typecommand

3、sintothe“Command”box3.typeasetofcommandsintoasmallfile(calleda-do-file)andthenrunthewholesetofcommandsatonce.Ultimately,youwanttouse-do-filesforallofyourresearchworkbecauseitistheonlywaythatyoucanexactlyreproduceanyanalysesthatyouhavedone.Tomoveyouinthisdirection,wewil

4、lprimarilyusethe“Command”box(ietypeincommands),butifyouarestuck,youcanusethemenus.VHM-811IntroductiontoStata121SmallStepstoGetYouStartedThefollowingtableoutlines21simplestepsthatwillgetyoustartedusingStata.Theseexercisesuseadataset(nocardia.dta)thathasalreadybeensavedi

5、nStataformat.Thesedataareasubsetofthedatafromacase-controlstudyofNocardiamastitiscarriedoutinNovaScotia.Adescriptionofthedatasetisattachedbelow.StepCommandDescriptionandExamples/KEY1pwdtellsyouwhatthecurrentworkingdirectoryis2cdchangesthecurrentworkingdirectorycdc:ov

6、a05data3useopensadatasetusenocardiaNote:OpenintheFilemenudoesnotchangethedefaultdirectoryNote:Whenafileisopen,itmeansthatStatahasloadeditintomemoryandeverythingdonetothatfileonlyhappensonthecopyinmemory.Wewilltalkaboutsavingchangespermanentlylater.4describedescribesad

7、ataset5listlistthecontentsofadatasetNote:ifthereismorethan1screenfullofdata....HRmovesyouononeline,spacebarmovesyouononescreen,BREAKstopsthedisplay)6browsebringsupaspreadsheet-likedatabrowserthatyoucanusetolookatyourdata(butnotmakechangestoit).Ifyouneedtoedityourdataus

8、ethe-edit-command7sumsummarystatisticsforadatasetsumsumcasecontnumcowprodbycasecont:sumsumcasecont,dbycasecont:sumnum