我运行ssc install xtabond2命令出现了以下提示:
checking xtabond2 consistency and verifying not already installed...
connection timed out -- see help r(2) for troubleshooting
could not copy http://fmwww.bc.edu/repec/bocode/x/xtabond2.mata
(no action taken)
我是stat13.1,怎么安装此命令呢?