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
AP Photo/Evan Vucci. (CBS News) CHICAGO -- There's something about golf that makes it a compelling pastime for American presidents. President Obama spent about 4 hours on Father's Day playing a round of golf at the Beverly Country Club with two old friends and an aide. It was his 100th round of golf since taking office. By the number of times he plays, it's clear Mr. Obama enjoys golf, though only on a few occasions has he spoken publicly about the game.