免费在线版《Learning SAS by Example, A Programmer's Guide》

Thanks

tryit

谢谢分享！

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example是最容易掌握de

多谢了

在线版指什么意思？看看

太好了！ 谢谢！

Sometimes despite your best efforts, your data may be incomplete. The value of a particular variable may be missing for
some observations. In those cases, missing character data are represented by blanks, and missing numeric data are
represented by a single period (.). In the preceding data set, the value of Weight for observation 5 is missing, and its place
is marked by a period. The value of Name for observation 6 is missing and is just left blank.

谢谢楼主