If you have a nominal variable that has more than two levels, you need to create multiple dummy variables to take the place of the original nominal variable. For example, imagine that you wanted to predict depression from year in school: freshman, sophomore, junior, or senior.
Washington Post, Redskinsâ Kirk Cousins played a round of golf with President Trump, June 14, 2017. The Hill, Trump plays 18 holes of golf at Virginia club, June 25, 2017. Washington Post, Trump had a terrible July, but at least he played a lot of golf, July 31, 2017. Washington Post, Trump seen at his N.J. golf course, Aug. 7, 2017
In fact, Obama is the 15th of the last 18 presidents to play golf. Not only is he a hugely avid golfer, but a pretty fair one, too. As far as how much time he spends on the links, his annual rate of play is about the same as President Dwight D. Eisenhower, with President Bill Clinton right on their heels. It's clear, the presidency and our great game have quite a thing going.