don't be a SAS dinosaur

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1、SASGlobalForum2009FoundationsandFundamentalsPaper143-2009®Don'tBeaSASDinosaur:ModernizingProgramswithBaseSAS9.2EnhancementsWarrenRepoleJr.,SASInstituteInc.ABSTRACTNewfeaturesoftheSAS®programminglanguageoftenpermitthereplacementofcomplexalgorithmsandclunkyworkaroundswithmoreelega

2、ntcode.Someenhancementssupportthecreationofmoreefficientsolutions.WhetheryouareaSASprogrammerwithmanyyearsofexperienceoranoviceuserwhoisresponsibleformaintaininglegacyprograms,implementingupdatedapproachescanallowyoutostreamlineyourSASapplications,expeditethedevelopmentanddebugg

3、ingprocess,andminimizefuturemaintenanceofthecode.INTRODUCTIONThispapercoversaselectionofenhancementsimplementedinSAS9.2,includingnewfeaturesofBaseSASprocedures,theDATAstep,functions,formats,andthemacrolanguage.EachenhancementispairedwithanalternativetechniqueavailablepriortoSAS9

4、.2.Thisallowsforcomparisonofolderandnewerapproaches.TheprimarymotivationforexploitingSAS9.2enhancementsistheabilitytocreaterobustyeteasy-to-maintainSASprogramswithlessprogrammereffort.Efficiencygainsintermsofmachineresourcesmightbeachieved,buttheyareofsecondaryimportanceinmostex

5、amples.BASESASPROCEDURESPROCPRINT:BLANKLINE=OPTIONInsertingablanklineintoPROCPRINToutputaftereverynobservationscouldenhancereadability,butthiswasdifficulttoaccomplishpriortoSAS9.2.Observationswithmissingvalueswereinserted,theMISSING=systemoptionwasswitchedtoablank(thenresettoits

6、defaultvalueafterward),andtheNOOBSoptionwasrequired.InSAS9.2producingthistypeofreportissimpleusingtheBLANKLINE=optioninthePROCPRINTstatement.dataclass_blanks(drop=i);setsashelp.class;output;ifmod(_n_,5)=0;arrayalln{*}_numeric_;arrayallc{*}_character_;doi=1todim(alln);alln{i}=.;e

7、nd;procprintdata=sashelp.classdoi=1todim(allc);allc{i}="";end;blankline=5;output;run;run;optionsmissing="";procprintdata=class_blanksnoobs;run;optionsmissing=".";Figure1a.Figure1b.PROCPRINTcodebeforeSAS9.2PROCPRINTcodewithBLANKLINE=option1SASGlobalForum2009FoundationsandFundamen

8、talsObsNameSexAgeHeightWeight1AlfredM1469.0112.