relationship between reliability and validity

If multiple testing facilities are unavailable, the Lohman two-component (Db) model would be the criterion method of choice. Based on high r2 (≥.942) values, low standard errors of estimate (SEE = 1.8 %BF males, 1.1 %BF females) and low total prediction errors (TE = 1.9 %BF males, 2.0 %BF females), the Lohman age-adjusted prediction equation showed the best agreement with the four component model. According to the lecture, if an assessment is reliable, then it works well and you can trust it. is a measure that specifies the relationship between observed and. Of the prediction models tested, the four-component model was considered the most accurate laboratory-based criterion model since it involves measurement of the primary constituents of fat-free mass. What is the relationship between reliability and validity when results are clustered, but miss the target Answer: Reliable, but not valid. Concepts such as reliability and validity are defined on the basis of co-variation. Five different prediction models were evaluated. Criterion measurements included body density (Db) by hydrostatic weighing, total body water (TBW) by deuterium oxide dilution, and total body mineral content (TMC) by dual energy x-ray absorptiometry.

Subjects were 48 (24 boys and 24 girls) peripubertal children evenly distributed according to stage of maturation. This study reports a cross-validation analysis of selected laboratory-based criterion methods in an attempt to identify the most appropriate reference which could be used in future validation studies of the more practical field/clinical testing methods. This is all that needs to be known aboutpsychometrics.

Many sex- and age-specific modified equations have been proposed. Grasping the above fundamentals leadsto a complete understanding of the concepts of reliabilityand validity and their relationship: validity is totallypredicated upon reliability and reliability in itself isinsufcient. Even though known to overpredict percent body fat (%BF), the use of adult prediction equations is widespread in the pediatric literature. The lack of chemical maturity, subsequent to normal growth and maturation, complicates the assessment of body composition in children.

Relationship between reliability and validity