这种东西一般都没有什么差别的~

因为我在淘宝里买盗版的，发现第三版反而比第四版卖的贵，是不是第三版比第四版好呢？好奇怪啊~~~不是应该版越新越全面么？ 2# szshhh

那就买第四版好了，新的东西多一些。

This fourth edition of The Little SAS Book: A Primer includes some SAS features added since SAS 9.1
and a few features that are not new, but nonetheless new to this book.
A major new feature with SAS 9.2 is ODS Graphics. ODS Graphics is a whole new way of creating
graphs using SAS. We added 11 new sections on ODS Graphics to this edition including ODS
Graphics concepts, the SGPLOT procedure, and producing ODS Graphics in statistical procedures.
Other new topics we added to the book are the WHERE= data set option, computed variables in
PROC REPORT, and grouping in procedures with user-defined formats. In addition, we added 16
new functions, and more on viewing SAS data sets using Viewtable.
Most of the features in this edition are available with SAS 9.1.3; a few are new with SAS 9.2. We
have tried to point out whenever a feature is new. So unless otherwise noted, you can assume that
everything in this book is available in SAS 9.1.3.

呵呵，我来看答案的