楼主，那提示不是说明已经安装成功了吗？
何来没有安装。

没有啊，是not already installed  .额。。。。

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package dm71 from http://www.stata.com/stb/stb51
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TITLE
      STB-51 dm71.  Calculating the product of observations.

DESCRIPTION/AUTHOR(S)
      STB insert by Philip Ryan, University of Adelaide, Australia.
      Support:  pryan@medicine.adelaide.edu.au
      After installation, see help prod.

INSTALLATION FILES                                  (click here to install)
      dm71/_gprod.ado
      dm71/prod.hlp
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(click here to return to the previous screen)


在help里面找prod 看看能不能找到
能找到就是安装了啊

package name:  dm71.pkg
from:  http://www.stata.com/stb/stb51/

checking dm71 consistency and verifying not already        installed...
cannot write in directory D:\stata11\ado\plus\
奥，但又成这样了，谢谢，不知道哪出问题，应该是没安装上，因为prod连乘命令用不了