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Difficulty level of the items (p), is assumed to be the same for each item, however, in practice, KR-21 can be applied by finding the average item difficulty across the entirety of the test. KR-21 tends to be a more conservative estimate of reliability than KR-20, which in turn is a more conservative estimate than Cronbach's α .
Sport, Exercise, and Performance Psychology is a peer-reviewed academic journal published by the American Psychological Association.The journal was established in 2011 and covers research "that supports the application of psychological principles to facilitate peak sport performance, enhance physical activity participation, and achieve optimal human performance". [1]
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Statistical methods for psychology include development and application statistical theory and methods for modeling psychological data. These methods include psychometrics, factor analysis, experimental designs, and Bayesian statistics. The article also discusses journals in the same field. [1]
The FIG gives difficulty points for number of somersaults, number of body twists and the body position in somersaults (piked or straight). The total sum of the individual elements forms the difficulty score component of competitor's final score: [14] [15] Each 1/4 rotation of a somersault = 0.1 DD; Completed 360° somersault (bonus) = 0.1 DD
Journal ranking is widely used in academic circles in the evaluation of an academic journal's impact and quality. Journal rankings are intended to reflect the place of a journal within its field, the relative difficulty of being published in that journal, and the prestige associated with it.
The North American Society for the Psychology of Sport and Physical Activity (NASPSPA) a multidisciplinary association of scholars from the behavioral sciences. . Organization is related professions with the goals of promoting the scientific study of human behavior in sport and physical activity, facilitating dissemination of scientific knowledge, and advancing the improvement of research and
Archives of Scientific Psychology is an open access academic journal published by the American Psychological Association. [ 1 ] [ 2 ] The journal publishes articles pertaining to the many different sub-fields of psychology, including neuroscience and political psychology . [ 3 ]