<P>我按照论坛中说的方法下载新命令，输入FINDIT XTSERIAL后，显示：</P>
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<P> Keywords:xtserial<BR> Search:(1) Official help files, FAQs, Examples, SJs, and STBs<BR> (2) Web resources from Stata and from other users</P>
<P><BR>Search of official help files, FAQs, Examples, SJs, and STBs</P>
<P>FAQ . . . . Testing for panel-level heteroskedasticity and autocorrelation<BR> . . . . . . . . . . . . . . . . . . . . . . . .V. Wiggins and B. Poi<BR> 12/03 How do I test for panel-level heteroskedasticity<BR> and autocorrelation?<BR> <a href="http://www.stata.com/support/faqs/stat/panel.html" target="_blank" >http://www.stata.com/support/faqs/stat/panel.html</A></P>
<P>SJ-3-2st0039. . Testing for serial correlation in linear panel-data models<BR> (help xtserial if installed). . . . . . . . . . . . .D. M. Drukker<BR> Q2/03 SJ 3(2):168--177<BR> test for serial correlation in random- or fixed-effects<BR> one-way models that can be applied under general conditions</P>
<P>Web resources from Stata and other users</P>
<P>(contacting <a href="http://www.stata.com" target="_blank" >http://www.stata.com</A>)<BR><a href="http://www.stata.com/websee.cgi?r=2&amp;s=bds&amp;o=w&amp;j=a&amp;k=xtserial" target="_blank" >http://www.stata.com/websee.cgi?r=2&amp;s=bds&amp;o=w&amp;j=a&amp;k=xtserial</A> could not be opene<BR>&gt; d for read by copytextfile</P>
<P>r(601);<BR>再输入net sj 3-2 st0039后显示：</P>
<P>connection timed out -- see help r(2) for troubleshooting<BR><a href="http://www.stata-journal.com/software/sj3-2/" target="_blank" >http://www.stata-journal.com/software/sj3-2/</A> either<BR>1)is not a valid URL, or<BR>2)could not be contacted, or<BR>3)is not a Stata download site (has no stata.toc file).<BR>r(2);<BR>请问这是怎么回事，到底如何下载新命令呢？写论文很急，请大家指点，多谢！</P>