Sesgo partidista en medios informativos. Una crítica metodológica y propuesta

Scientific proof of party bias has been complicated due to their methodological difficulties, here examined: structural ones, when researchers take for granted the norm of objectivity in systems that could uphold different values; organizational ones, when researchers ignore the organizational superiority of some campaigns over others; and methodological ones, about sampling and validity of commonly used indicators. We suggest some practices to avoid these issues and illustrate their worth in the coverage of the Mexican presidential elections of 2012, with promising results.