黄老师,用ssc install xtqreg不能安装,会出现如下情况:
ssc install xtqreg
connection timed out -- see help r(2) for troubleshooting
http://fmwww.bc.edu/repec/bocode/x/ either
1) is not a valid URL, or
2) could not be contacted, or
3) is not a Stata download site (has no stata.toc file).
current site is still http://www.imm.ki.se/biostatistics/stata/
r(2);
请问这是怎么回事呢


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