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These predictive equations use skinfold measurements, body circumference measurements (e.g., abdominal circumference), and, in the Abdel-Malek article, simply height and weight. Gardner and Poehlman (1993, 1994) supplement these body measurements with a measure of physical activity to predict body density from which, as we shall see below, body fat can be estimated. 2 Such predictive equations for the determination of body fat can be determined through multiple regression. A group of subjects is gathered, software for tracking body fat and various body measurements and an accurate estimate of the software for tracking body fat percentage of body fat are recorded for software for tracking body fat each. Then body fat can be fit to the other measurements using multiple regression, giving, we hope, a useful predictive equation for people similar to the subjects. The various measurements other than body fat recorded on the subjects are, implicitly, ones that are easy to obtain and serve as proxies for body fat, which is not so easily obtained.
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