你可以输入命令findit xtserial
  这个命令如果还是不行，建议输入findit xt试试，会出现很多命令，找到你想要找的那个，或者近似的，点进去看看是不是 xtserial
包含在其他的大命令中。

package installation
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package name:  st0039.pkg
        from:  http://www.stata-journal.com/software/sj3-2/

checking st0039 consistency and verifying not already installed...

the following files already exist and are different:
    D:\stata11\ado\plus\x\xtserial.ado
    D:\stata11\ado\plus\x\xtserial.hlp

no files installed or copied

Possible things to do:

    1.  Forget it
        (best choice if any of the above files were written by you and just
        happen to have the same name or you do not want the originals changed)

    2.  Look for an already-installed package of the same name
        (which you might then choose to uninstall)

    3.  Search installed packages for the duplicate file(s) by clicking
        on the file names above

    4.  Force installation replacing already-installed files
        (if this is an update, this would be a safe choice; you will end
        up with the original and the update apparently installed, but it
        doesn't matter; you can even uninstall the original later)

(no action taken)

r(602);
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(click here to return to the previous screen)
出现这样结果什么意思

我也不太懂，我昨天是下载别的命令摸索出来的方法，对于你的问题我不太懂

你能把你的命令发给我一份949133897@qq.com多谢了

这个命令我是直接安装在stata中的，我没有找到这些命令在哪里？你还是按照你的错误提示，翻一下你的错误提示是什么意思，看看它的方法行吗