多谢分享

感谢chenjieren！

谢谢楼主

楼主好人

看看！

good book. thank you.

thanks

谢谢分享！！！

謝謝分享

asdf asdf asdf

Thanks

tryit

谢谢分享！

顶顶顶顶顶顶顶顶顶顶顶顶顶顶

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

谢谢分享！

谢谢分享

xiexiexie

jjjj

Mandarin Consultant

要看，要看

ddddddddddddd

thanks

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