Abstract
By applying the computational method of decision trees, this research identifies the most decisive attributes enhancing ad persuasiveness by examining the contextual effects of emotional (in)congruence on ad placement for music videos on YouTube. Findings of this interdisciplinary research not only evaluated key psychological constructs via a computational approach to predict persuasiveness but also extended the theoretical consideration of contextual (in)congruence into the domain of emotion. Methodologically, this study demonstrates the effectiveness of decision trees in exploratory theory testing. Practically, the predictive results from the decision tree model provide much needed strategic guidance to inform advertising design and evaluation for video-sharing websites.