發送短信

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 /_____// | || | || | |  | ||   / _ \\   / ____|| 
 `____ `  | || | || | |/\| ||  / //\ \\ / //---`' 
 /___//   | \\_/ || |  /\  || |  ___  ||\ \\___   
 `__ `     \____//  |_// \_|| |_||  |_|| \_____|| 
 /_//       `---`   `-`   `-` `-`   `-`   `----`  
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發送短信 : An empirical likelihood estimator of stochastic frontier model