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 $10.; 就是一个length Statement，x是一个sas名称，'$'和'.'是特殊符号。函数是SAS Statement的一种特殊组成部分，能接收输入，并返回输出。函数名称后面跟着小括号，小括号里面的参数用
程序以DATA语句开头,为SAS数据集,视图或程序提供名字。 DATA <data-set-name-1 <(data-set-options-1)>> <... data-set-name-n <(data-set-options-n)>> </ <DEBUG> <NESTING> <STACK = stack-size>> <NOLIST>; SET<SAS-data-s...
(1)IF语句是面向“程序数据向量”(Program Data Vector)的,对当前PDV中的数据进行判断,满足条件时将其写入到外部数据集;WHERE语句也是面向PDV的,它使用于从外部数据源读数据到PDV之前进行判断,当满足条件时才被写入到PDV。显然一个在写入PDV之前,一个在写入PDV之后,两者是有差异的。 (2)当没有数据集选项firstobs...
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...
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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...
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...
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“...
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Where time is money, Viya saves you both. With our data and AI platform, you can understand what’s happening with your data now, predict how to pivot seamlessly, and get results faster. Regardless of roles, everyone in your organization will feel the impact. Learn just how much your orga...