SAS基础编程预习指南：预备SAS 9.2认证
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更新于2024-07-23
收藏 5.88MB PDF 举报 "《SAS认证预备指南：基础编程》是一份针对SAS 9.2版本的权威学习资料，专注于帮助考生准备SAS认证考试。本书主要围绕基础概念和文件管理展开，旨在提升读者对SAS编程语言的理解。
第一章“基本概念”从宏观层面介绍了SAS程序的基础要素，包括概述、目的和目标，以及如何编写和执行SAS程序。章节详细讲解了SAS程序的组成，如组成部分、特点和布局，以及处理SAS程序时的日志消息和结果。此外，还深入解析了SAS库文件的存储方式，临时和永久文件的引用规则，以及两层名称的使用。SAS数据集是核心内容，涵盖了数据集的概述、描述符部分、数据部分、观测值、变量属性（如名称、类型、长度、格式和标签）等，并提醒读者注意关键要点。
第二章“文件引用与设置选项”着重于实际操作技巧，讲解如何引用文件和设置各种选项。这一章节指导读者如何正确分配库引用，验证引用的有效性，理解库引用的作用持续时间，以及如何使用两层名称和不同格式。通过本章的学习，读者可以掌握如何有效地管理和组织SAS工作环境。
这本书不仅适合备考者系统复习，也适合初学者作为SAS编程的入门手册，它详细而实用，有助于建立扎实的SAS基础，提升编程技能，为后续的认证考试打下坚实基础。无论是希望通过SAS认证还是希望在日常工作中熟练运用SAS工具的专业人士，都能从中受益匪浅。"
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So referencing a SAS file in any library except Work indicates that the SAS file is stored
permanently. For example, when our sample program creates Clinic.Admit2, it stores the new
Admit2 data set permanently in the SAS library Clinic.
Rules for SAS Names
SAS data set names
can be 1 to 32 characters long
must begin with a letter (A–Z, either uppercase or lowercase) or an underscore (_)
can continue with any combination of numbers, letters, or underscores.
These are examples of valid data set names:
Payroll
LABDATA1995_1997
_EstimatedTaxPayments3
SAS Data Sets
So far, you've seen the components and characteristics of SAS programs, including how they
reference SAS data sets. Data sets are one type of SAS file. There are other types of SAS files
(such as catalogs), but this chapter focuses on SAS data sets. For many procedures and for
some DATA step statements, data must be in the form of a SAS data set to be processed. Now
let's take a closer look at SAS data sets.
Overview of Data Sets
As you saw in our sample program, for many of the data processing tasks that you perform with
SAS, you
access data in the form of a SAS data set
analyze, manage, or present the data.
Conceptually, a SAS data set is a file that consists of two parts: a descriptor portion and a data
portion. Sometimes a SAS data set also points to one or more indexes, which enable SAS to
locate records in the data set more efficiently. (The data sets that you see in this chapter do not
contain indexes.)
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