Bias - an inclination of temperament or outlook; especially : a personal and sometimes unreasoned judgment. -- Merriam Webster Dictionary
Groseclose, Tim, and Jeffrey Milyo. 2005. "A Measure of Media Bias." Quarterly Journal Of Economics 120, no. 4: 1191-1237. Business Source Complete, EBSCOhost (accessed December 16, 2016). (Available full-text on UK Campus and libraries with access to KYVL resources).