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Psychology's standing within a hypothesized hierarchy of the sciences was assessed in a 2-part analysis. First, an internally consistent composite measure was constructed from 7 primary indicators of scientific status (theories-to-laws ratio, consultation rate, obsolescence rate, graph prominence, early impact rate, peer evaluation consensus, and citation concentration). Second, this composite measure was validated through 5 secondary indicators (lecture disfluency, citation immediacy, anticipation frequency, age at receipt of Nobel Prize, and rated disciplinary hardness). Analyses showed that the measures reflected a single dimension on which 5 disciplines could be reliably ranked in the following order: physics, chemistry, biology, psychology, and sociology. Significantly, psychology placed much closer to biology than to sociology, forming a pair of life sciences clearly separated from the other sciences.
Dean Keith Simonton (Mon,) studied this question.