Estimates regarding population parameters are often based on data from surveys. To ensure that such estimates are as accurate as possible, it is important to know the detectability resulting from the particular survey method used. We used radiotelemetry to measure detectability of ornate box turtles (Terrapene ornata), using visual-encounter surveys in a sand prairie in northwestern Illinois, U...

Even though visual images and television are ubiquitous in politics, surveys rarely use visuals to assess what people know about politics. I measure visual political knowledge in a series of experiments that ask otherwise identical questions using either relevant visual elements or words only. These experiments were embedded in two representative surveys of U.S. residents conducted in 2003 and ...