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...
firstnamecontains'Jon'; in 属于 actlevel in ('LOW','MOD'); fee in (124.80,178.20); and 且 age<=55 and pulse>75; or 或 area='A' or region='S'; 二、数据步中使用IF-THEN语句赋值 数据步中经常需要有选择地赋值新变量或修改原数值。
(三)数据步中使用IF-THEN语句创建子数据集(也见系列03) 数据步读入数据时,用IF-THEN语句选择满足条件的数据读入。 语法: if 条件; 如果“条件”为真,则数据步将继续执行。还可以使用DELETE语句,来删除哪些不要的数据: 下面这两句话是等价的: if Sex='f'; if Sex='m' then DELETE; 例2莎士比亚歌剧的清单...
pagebyvariable; Specifying Titles and Footnotes in Procedure Output title'text'; footnote'text'; 都是Global statement it both appear in the PROC PRINT step and PROC MEANS step 会redefine: 数字越小的order越高 定义在后面的话会覆盖前面比他order低的 cancel footnote and title: 定义一个null footnote...
SAS中_N_代表：_n_是data步的自动变量，_n_表示观测的序号。通俗一点就是“表格的第几行”。_n_不在数据集中，但可以用一个变量来表示——就是“t=_n_;”。SAS（全称STATISTICAL ANALYSIS SYSTEM，简称SAS）是全球最大的软件公司之一，是由美国NORTH CAROLINA州立大学1966年开发的统计分析软件。SA...
8、和Eastern Europe的所有数据:proc sql;select *from sashelp.shoeswhere Region in (Africa,Eastern Europe);quit;2.6.4 CONTAINS或?:判断某列是否包含指定字符串 例如,选择列Region包含Afr的数据:proc sql;LT大于EQ=等于LE=大于或等于NEA =不等于2.6 where子集查询2.6.1先列出比较运算符where语句用到的比较运...
4. Correct answer: b When you submit a SAS statement that contains an invalid option, a log message notifies you that the option is not valid or not recognized. You should recall the program, remove or replace the invalid option, check your statement syntax as needed, and resubmit the ...
SAS data set is a SAS file, which holds data. Data should be in the form of a SAS data set to get processed. A SAS data set contains data value organized as a table of observations and variables to process by SAS.
When you want to read the entire file, you can remove the obs= option entirely.A typical infile statement for reading a comma delimited file that contains the variable names in the first line of data would be:INFILE "test.txt" 47、 DLM=',' DSD MISSOVER FIRSTOBS=2 ; 读入有缺失值的...
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