Abstract
ABSTRACT Measures of news exposure are common in research that tries to explain political knowledge, political engagement, opinion formation and, more generally, media effects. Much of that research employs self-reported measures obtained with surveys, known to suffer from accuracy problems. Observational measures, however, also suffer from limitations derived from data collection and instrumentation. Here we offer new comparative evidence on the nature of those problems. We show that commonly used self-report measures of digital news consumption are problematic for three reasons: they only pay attention to a small fraction of all available sources; they underestimate audience share; and they distort the relative position of news sites in visibility rankings. Measurement problems, however, also exist in observational studies, especially when mobile access is excluded from data collection. Our analyses quantify the magnitude of these problems, offering unprecedented comparative evidence of online news consumption that spans nine countries and a period of five years. We discuss the implications of our findings for future research on news exposure.
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