Introduction to Stata - Session 3STATA会话3介绍

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1、IntroductiontoStata-Session3Simon,HongECON3150/4150,UiOJanuary15,20181/29Beforewestart1.Downloadcaschool.dtafromcoursewebpage2.StartSTATAfromtheStartmenu2.1Alternatively,fromkiosk.uio.nousinginternetexplorer:Logon,navigatetoanalyse,openStata2/29Outline1.Stataw

2、ork ow2.Workingwithdo-lesItextleswithStatacode,whybetter?Iformatting:makeyourlereadableIcomments:includedescriptionofthecode3.Regression,prediction,testing4.BasicgraphsIscatterplotsIlineplotsIoverlyinggraphsIbasicformattingIexporting3/29Statawork owAlwaysbe

3、ttertoseparatechanging&analysingthedata:1.FirstprepareyourdataforanalysisIcopydatafromdisktomemoryIdescribedataIchangedateIsavemodieddatatodiskundernewname2.ThenanalysethemodieddataIcopyanalysisdataintomemoryIstartloggingresultstoleIperformanalysisIcloselog

4、leAdvice:onedirectoryperproject&startsessioninprojectdirectory4/29DOlesUntilnowwehavemostlyusedthecommandline:IgreattodevelopbutnottoreproduceyouranalysisIALWAYSorganizeyourworkinStatascriptsStatascriptsarecalleddo-lesaftertheirextension(.do)Usedo-les(with

5、informativenames)toorganizeyourwork:Icreatedatasetcrincome.domakesdataleincome.dtaIanalysisandescr.docalculatesmydescriptivestatisticsanreg.doperformsmyregressionanalysisImakinggraphsgrwageplot.domakesthegraphwageplot.eps5/29Makeado-leUsecaschool.dta,thenope

6、nadoleandtrytodothefollowingthings1.ReadthedataintoStata2.Keeponlyread_scr,math_scr,enrl_tot,teachersandel_pct3.Makenewvariablescoreequaltomeanofreadingandmathscore4.Makenewvarstrequalthestudent-to-teacherratio5.Labelthevariables:enrl_totEnrollmentteachersTea

7、chersel_pctPercentenglish-learnersscoreMeantestscorestrStudent/Teachers6.Makeanewvariablezscoreasstandardizedscore,i.e.scoremean(score)zscore=SD(score)6/29Incasesomethingwentwrongcd"PATH"use"PATH/caschool.dta",cleardesckeepread_scrmath_screnrl_totteachersel_p

8、ctegenscore=rowmean(read_scrmath_scr)genstr=enrl_tot/teacherslabelvarscore"Testscore"labelvarenrl_tot"Enrollment"labelvarteachers"Teachers"labelvarstr"Student/Teacher"labelvarel_pc