=+22. Baseball attendance. Pedro Martinez, who retired from Major League Baseball in 2012, had a stellar career, helping the Boston Red Sox to their first World Series title in 86 years in 2004. The next year he became a free agent and the New York Mets picked him up for $53 million for 4 years. Even after the move to New York, Martinez had his own fans. Possibly, he attracted more fans to the ballpark when he pitched at home, helping to justify his multimillion dollar contract. Was there really a “Pedro effect” in attendance? We have data for the Mets home games of the 2005 season. The regression has the following predictors:

M18_SHAR8696_03_SE_C18.indd 664 14/07/14 7:37 AM Exercises 665 Weekend 1 if game is on a weekend day or night, 0 otherwise