【简答题】When I was quite young, I discovered that somewhere inside the telephone lived an amazing person - 'Information Please' and there was nothing she did not know. One day while my mother was out, I hit m...
【简答题】Which of the following is true of dummy variables?A. a. A dummy variable always takes a value less than 1.B. b. A dummy variable always takes a value higher than 1.C. c. A dummy variable takes a va...