Alex Goldmark Using 'Sentiment Analysis' To Understand Trump's Tweets By Alex Goldmark • Apr 13, 2017 Copyright 2017 NPR. To see more, visit http://www.npr.org/. RACHEL MARTIN, HOST: National Contest Spurs Economic Growth In Nigeria By Alex Goldmark • May 13, 2016 Copyright 2016 NPR. To see more, visit http://www.npr.org/.