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This article is a reflection of international publication trends across prominent journals in the field of mental retardation. Journals reviewed were the Journal of Applied Behavior Analysis, Journal of Intellectual Disability Research, Mental Retardation, and Research in Developmental Disabilities. Percentage of authors from the United States (US) and other countries were evaluated. US authors represented 84–91% in US journals, while US representation in foreign journals was much lower at 21%. The implications of these findings are discussed.
There appear to be some logical errors in recent attempts to test the hypotheses. (1) that the process of dark adaptation is controlled by the concentration of a substance in the receptors (the photochemical hypothesis) and (2) that the state of the visual system during dark adaptation is equivalent to that produced by some stabilized steady background (the equivalent-background hypothesis). The various factors that should be considered in testing these hypotheses are Nike Free Run Trainers Women discussed.
Previous studies of the so-called frontier production function have not utilized an adequate characterization of the disturbance term Cheap Nike Free Uk for such a model. In this paper we provide an appropriate specification, by defining the disturbance term as the sum of symmetric normal and (negative) half-normal random variables. Various aspects of maximum-likelihood estimation for the coefficients of a production function with an additive disturbance term of this sort are then considered.