“…In the first place, the sampled films will often span non-equivalent and even non-overlapping periods of film history. Because of historical trends in the structure of the film industry, studies can obtain contradictory results even when the investigations are conducted by the same researcher using the same methods (e.g., Litman, 1983;Litman & Ahn, 1998;Litman & Kohl, 1989; see also Smith & Smith, 1986). Furthermore, the samples will differ on whether they include non-English-language films, documentaries, and animations-cinematic products that may have dissimilar success determinants (Simonton, 2007b).…”