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...
Ø data scores(keep=team game1 game2 game3); Ø data mydata(index=(b k) label='label for my data set' drop=p read=secret); Ø data idxdup2(compress=yes index=(ok1 ok2 ssn/unique ok3)); Ø proc print data=ne...
SAS dataset 有很多针对数据集的选项(option),这些选项都有同名的 statement. 常见的有: options 和 statement 的功能和使用方法几乎一致,区别在于:statement 只能在 DATA step 中使用;options 在 DATA / PROC step 中都可以使用,既可以用于 read-in data 也可以用于 write-in data, 写法统一是DATA=dataset (opti...
DATA new-data-set; MERGE data-set-1 data-set-2; BY variable-list; 注意,如果两个数据集有重叠的变量——除了BY变量,那么第二个数据集中的此变量会覆盖第一个数据集中的。 例子有一个巧克力店记录了每天所卖巧克力的类型以及数量,第一个文件sales data记录了所卖的巧克力代码和数量,第二个记录了巧克力代码...
(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 赋值语句“=”创建的变量 都会retain其值,在data步的迭代中。 6. 默认情况下,如果不使用 RETAIN 语句, SAS会自动将由 input 和 赋值语句...
data aaa; infileabctruncover; input var $3000.; run; 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. ...
DATA就是一个sas关键字，a就是一个sas名称。又比如 length x $10.; 就是一个length Statement，x...
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Then the formats are used in the PUT statement to derive VISITNUM and PCTPTNUM. The purpose of adding “+0” is to convert VISITNUM data type to numeric form. It is automatic converted in the SAS. Though it maybe does not produce “Warning“...
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. ...