(1) TheRETAINstatement specifiesvariableswhose values are not set to missing at the beginning of each iteration of the DATA step. (2)TheKEEPstatement specifies variables that are to be included in anydata setthat is being created. 5. 如果 retain语句 后面不跟任何变量,则: 会将所有由input和 ...
If so, which oneis preferred?* How a DATA step statement works? How set option facilitates the data step? How to use ABORT and STOPstatement in data step.* What's the best way to subset data - IF and/or Where statement? Demoed by use of some PROC statements.* Is it possible to ...
The variable must be numeric and has the initial value of zero. This statement adds the value of the expression to the variable while retaining the variable’s value from one iteration of the DATA step to the next。 下面两句和sum语句起到的效果一样 retain variable 0; variable = sum(variable...
When it encounters a DATA, PROC, or RUN statement, SAS stops reading statements and executes the previous step in the program. This program contains one DATA step and two PROC steps, for a total of three program steps. 编译阶段 During the compilation phase, the program data vector is create...
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Numeric variables always have a length of 8 bytes in the program data vector and during processing. 就是说length语句不会影响读入数据的长度,对于读入数据,原始长度是多少读进去就是多少 keep in mind that the LENGTH statement affects the length of a numeric variable only in the output data set. ...
一、将数据录入SAS——DATA Step / Viewtable 1.Internal raw data- Datalines or Cards 命令; 2.External Raw data files- Infile 命令 + Input 命令; 二、将数据文件读入SAS ——DATA Step / PROC IMPORT 1.将SAS文件读入SAS—— data sasuser.saslin; ...
Data Step Method This works but becomes cumbersome when there are many subsidiaries and if you don’t know all of them data sales; merge sashelp.shoes(where=(subsidiary='Calgary') keep=product subsidiary sales rename=(sales=calgary)) sashelp.shoes(where=(subsidiary='Montreal') keep=product su...
SAS数据清理与分析技术指南说明书