jjjj6666 发表于 2014-2-19 06:55 
sorry, try this (missed a key word "var")
foreach vm of var var1 var2 var3 {
. foreach vm of var var1 var2 var3 {
  2.   2.     egen  double _`vm' = std(`vm')
  3.   3. }
unrecognized command:  2. invalid command name
r(199);
还是不行···我是stata11