宏用来处理重复工作最好，比如你需要跑10个回归，用proc reg...，这10个回归其他都一样，就是因变量y每次需要换。那么将回归程序写成一个宏，每次用的时候换参数就可以了。 总之，宏可以降低重复性工作的任务量，使程序模块化。 本节目录： 1. 宏概述 2. 用宏变量提交文本 3. 用宏创建
也就是说:符号“ & ”与“ . ” 之间的部分为要解析的变量名。 %letname=SaleQ;data work.&name.1work.&name.2work.&name.3work.&name.4;setsashelp.orsales;if(substr(quarter,5,2)='Q1')then output work.&name.1;elseif(substr(quarter,5,2)='Q2')then output work.&name.2;elseif(subst...
if y=3 then y3=1;else y3=0;run; 方法四:data e;set a;array a{3} y1 y2 y3;do i= 1 to 3;if y=1 then a{i}=i;else a{i}=0;end;drop i;run; 方法五:在LR建模的时候,可以直接使用class语句自动生成哑变量。proc logistic;set a;class y;model xx=y xx xx;run;...
One task is to change raw data into standard SDTM variable, such as if CPEVENT=”Treatment and Observation Period (Day1)” then VISIT=“Day 1”, or if CPEVENT=”Day 1” then VISITNUM=2001. Another commom task is value conversion between stan...
In a DATA step, if the DEQUOTE function returns a value to a variable that has not been previously assigned a length, then that variable is given the length of the argument. The Basics The value that is returned by the DEQUOTE function is determined ...
BY variable-1...variable-n; SAS首先会按照第一个变量排序,再对后面的排序。 Data=,out=用来指定输入和输出数据,如果缺失out=,则SAS会将排序后的数据集代替原来的数据集。下面的代码告诉SAS对数据messy排序,并将排序后的数据存在neat中: PROC SORT DATA=messy OUT=neat; ...
IF MOD(X,500)=0 THEN OUTPUT; END; RUN; PROC FORMAT ; VALUE AMTFMT LOW - 2000 = '(LOWER,2K]' 4000 <- 6000 = '(6K,8K]' 6000 <- HIGH = '(8K,HIGH)' OTHER = 'OTHER' ; DATA TBB ; SET TAA; Y = PUT(X ,AMTFMT.); ...
In version 6 the memory structure was reorganized to speed up the system time spent outside the ILDS [implied loop of the data step], but thePDVconcept continues to be a good way for the programmer to think about what is important to him in variable manipulation. ...
if u<=.67 then output train; else output validate; run; A DATA step is used to split DE VELOP into TRAIN and VALIDATE. The variable U is created using the RANUNI function, which generates pseudo-random numbers from a uniform distribution on the interval (0,1). The ...
Using %IF-%THEN-%ELSE in SAS Programs Doing More with SAS Studio Working with Queries Understanding Process Flows Setting Your Preferences Writing Your First Custom Task Accessing Data Accessing Data in SAS Libraries (Video) How Do I Access Data in SAS?