全部索引的删除,可以用调用datasets用_all_来进行删除。 ——— 二、数据集操作 数据集操作算是数据处理的精髓,一般来说可以用到以下的一些语句: /*data,创建数据集*//*set,读数据,纵向合并数据集*//*by,控制set merge modify update,分组变量*//*merge,横向合并数据集*//*update,更新SAS数据集*//*modify...
Be Careful When You Merge SAS Datasets!Obs12345Paper PO
2.2 c 3.3 ; run; So if you merge these datasets by name, you get: name a b c something_1 1 2 3 something_2 1 2 3 Now suppose that for some reason you would like to merge these data sets not by name, but by "something" (best reason: if that is the only variable you have...
The SAS hash object is an incredibly powerful technique forintegrating datafrom two or more datasets based ona common key. The SAShash objectprovide a very fast way tolook up datafrom one dataset based ona common keylinking records in another dataset. 优点: hash table 可以根据K-V定位数据,直接...
inputdatasetsmustbesortedbythecommonvariable(s) Fromnowonwhenweusetheterm"merge"itwillmean"match-merge." Examplesofmerging Whenwewanttocombinetwodatasetsbymergingandweknowbeforehandthateachobservationineachdatasethasamatchintheotherdatasetwecandoaverystraight-forwardmerge.Hereareacoupleofexamples. ...
Variable formats are handled by PROC COMPARE as it is used for comparing unformatted values. 22. What is the use of $BASE64X? By using $BASE64X encoding, the character data is converted into ASCII text. 23. What are the features of the SAS system?
在本章,将controlled terminology应用到 source datasets,以使 data records 正确地匹配到SDTM records。 其中,Codelist的参数有:CODELISTNAME、RANK、CODEVALUE、TRANSLATED、TYPE、CODELISTDICTIONARY、CODELISTVERSION、ORDERNUMBER、sourcedataset、sourcevariable、sourcevalue、sourcetype。 common.sas /*common.sas*/ libna...
This requirement often occurs when a small number of observations in one data set is to be merged on a common variable in a larger data set, and only those observations with a common value of the matching variable are desired in the new data set. Before the availability of the index ...
set WORK._TABLE1_ WORK._TABLE2_ ; by ID; keep ID NAME SEX AGE DATE HEIGHT WEIGHT ACTLEVEL FEE; run; ***Delete temporary data sets in WORK library***; proc datasets nolist; delete _TABLE1_ _TABLE2_ ; run; 10.3 数据变换 /*首先从文件h:\SAS数据分析系统教程\Data里把数据集Lm3复制...
SAS Data Step 4 Combine Datasets SASDataStep --CombiningMultipleSASDataSets Content Overview Concatenation One-to-OneMergeMatchedMerge 1 1 Fudan_R_Module_020810 Overview Determinewhatyouwanttheoutputtolooklike AA B A 2 B B Fudan_R_Module_020810 Overview Identifyhowtheinputdata...