按照论坛里说的，下载了xtbond2命令放在plus下面的字母文件夹里，输入ssc install xtabond2后显示
checking xtabond2 consistency and verifying not already installed...
cannot write in directory view dialog import_excel_dlg:\stata13\ado\plus\x

这是为什么呀？求指教，谢谢