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Introduction

Typographical Conventions

This book uses several different styles of type for presenting information. The following list explains the meaning of the typographical conventions used in this book:

   
 romanis the standard type style used for most text.
 UPPERCASE ROMANis used for SAS statements, options, variable names, and other SAS language elements when they appear in the text. However, you can enter these elements in your own SAS programs in lowercase, uppercase, or a mixture of the two.
   
 UPPERCASE BOLDis used in the "Syntax" sections for SAS keywords such as the names of statements and options.
   
 obliqueis used for user-supplied values for options (for example, INTERVAL=interval).
   
 boldis used to refer to matrices and vectors
   
 italicis used for terms that are defined in the text, for emphasis, and for references to publications.
   
 monospaceis used to show examples of SAS statements. In most cases, this book uses lowercase type for SAS statements. You can enter your own SAS statements in lowercase, uppercase, or a mixture of the two. The SAS System always changes your variable names to uppercase, but character variable values remain in lowercase if you have entered them that way. Enter any titles and footnotes exactly as you want them to appear on your output.

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