أرسل هذا في رسالة قصيرة: Analysis of Integrated and Cointegrated Time Series with R

             ___     _    _     _____    _    _   
  ____      / _ \\  | \  / ||  |  ___|| | || | || 
 |    \\   / //\ \\ |  \/  ||  | ||__   | || | || 
 | [] ||  |  ___  ||| .  . ||  | ||__   | \\_/ || 
 |  __//  |_||  |_|||_|\/|_||  |_____||  \____//  
 |_|`-`   `-`   `-` `-`  `-`   `-----`    `---`   
 `-`