發送短信

數:

提供者:

CAPTCHA:

  ______     ___      ____     __   __    _  _   
 /_   _//   / _ \\   |  _ \\   \ \\/ //  | \| || 
 `-| |,-   | / \ ||  | |_| ||   \ ` //   |  ' || 
   | ||    | \_/ ||  | .  //     | ||    | .  || 
   |_||     \___//   |_|\_\\     |_||    |_|\_|| 
   `-`'     `---`    `-` --`     `-`'    `-` -`

Please enter what you see:

發送短信 : On a necessary and sufficient identification condition of optimal treatment regimes with an instrumental variable