有关ppml回归的实现

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拟泊松似然估计（PPML）。
我使用的是STATA 11.在回归时显示：
ppml chinaexports lngdp lndistcircle

this is version 11.0 of Stata; it cannot run version 11.1 programs
     A free update to version 11.1 is available; type update and follow the
     instructions, or visit http://www.stata.com/support/updates.  If you are not
     connected to the Internet, you can contact StataCorp to obtain the latest version.
r(9);

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关键词：PML instruction Available connected programs ppml

然后使用update all
得到 ：

Utilities update log
    1.  verifying E:\soft ware\stata 11\Stata11\utilities is writeable
    2.  obtaining list of files to be updated
    3.  downloading relevant files to temporary area
        downloading d.pdf
        downloading g.pdf
        downloading gsm.pdf
unexpected end of file
r(612);

如何实现更新？

thanks and expecting.

what is the problem lies in it ?

any suggestion?

expecting.

is there some update file contains this command?

can update at another time.
try again will be ok.

用stata12 就可以了，另外请问楼主知道怎么用PPML方法估计面板数据模型吗？