以前的东西：

SAS OnlineTutor^®: Basic and Intermediate SAS^®的learning path见《SAS学习笔记：开篇》

SAS学习笔记（1）：Basic Concepts

SAS学习笔记（2）：Using the Programming Workspace

SAS学习笔记（3）:Referencing Files and Setting Options

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General form, basic INCLUDE command: INCLUDE 'file-specification'

where file-specification is the physical name by which the host system recognizes the file.

Because this is a command (not a SAS statement), no semicolon is used at the end.

SAS Program Structure

• begin DATA and PROC steps in column one
• indent statements within a step
• begin RUN statements in column one
• include a RUN statement after every DATA step or PROC step.

Error Types

So far, the programs that you've submitted in this lesson have been error-free, but programming errors do occur. SAS can detect several types of errors. The most common are

• syntax errors that occur when program statements do not conform to the rules of the SAS language
• data errors that occur when some data values are not appropriate for the SAS statements that are specified in a program.