(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...
sas条 件判断语句 where,if的 区别,以及 where选 项 1:where和If最本质的区别,以及一些小的区别 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...
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。
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...
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...
The YYQ function returns a SAS date value that corresponds to the first day of the specified quarter. If eitheryearorquarteris missing, or if the quarter value is not valid, the result is missing. Syntax : YYQ(year,quarter) 三、日期提取 ...
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...
contains或?包含firstnamecontains'Jon'; in属于 actlevelin('LOW','MOD'); feein(124.80,178.20); and且age<=55andpulse>75; or或area='A'orregion='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。
If the output statement above were omitted, only the last group of measurments would appear in the SAS data set. The counter for a do-loop can take values specified by a comma delimited list. Examples: do sex=m,f; ... end; do parity=1,3,5; ... end; A counterless do-loop can...
Cell: Each graph can have one or more data areas to display the data as shown in Figure 2.2. Each one of these is referred to as a “Cell”. A cell might or might not have axes. Plot statements: Each plot statement is responsible for drawing only its own data representation. The con...