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It is known that statistically significant results are more likely to be published than results that are not statistically significant. However, it is unclear whether negative results are disappearing from papers, and whether there exists a 'hierarchy of sciences' with the social sciences publishing more positive results than the physical sciences. Using Scopus, we conducted a search in the abstracts of papers published between 1990 and 2014, and calculated the percentage of papers reportingdoi:10.7287/peerj.preprints.447v2 fatcat:y3jvwnq5arbxfmuttxg2m53iii