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...
data a1;setsashelp.class(keep=name sex);/*keep name sex;*/ *如果使用keep语句而不使用keep选项,那么pdv会读入先所有的变量再保留需要保留的,而用keep=选项则能保持每次只读入需要读入的变量; set sashelp.class(keep = _character_); *只读入字符型变量; set sashelp.class(keep = _numeric_); *只读...
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...
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. ...
数据集选项影响的只是SAS如何读取和写入一个单个的数据集,可以在数据步(DATA,SET,MERGE,or UPDATE 语句)和过程步(conjuctionwith a DATA=statement option)中使用。用法是,接在数据集名之后,用括号括起来。有些最常见的选项: KEEP=variable-list 告诉SAS保留哪个变量 ...
例如 DATA a; 就是一个DATA Statement。DATA就是一个sas关键字，a就是一个sas名称。又比如 length 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“...
1.1:The WHERE statement examines what is in the input page buffer and selects observations before they are loaded in the program data vector, which results in a savings in CPU operations(Where从buffer中进行筛选再读入pdv) The subsetting IF statement loads all observations sequentially into the pro...