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The book puts the broad-sense heritability of g at .40 to .50 in children, at .60 to .70 in adolescents and young adults, and at nearly .80 in older adults. It argues that shared family influences on g are substantial in childhood, but that in adults the environmental sources of variance are almost exclusively of the within-family kind.
External validity is the validity of applying the conclusions of a scientific study outside the context of that study. [1] In other words, it is the extent to which the results of a study can generalize or transport to other situations, people, stimuli, and times. [2] [3] Generalizability refers to the applicability of a predefined sample to a ...
Generalizability theory, or G theory, is a statistical framework for conceptualizing, investigating, and designing reliable observations. It is used to determine the reliability (i.e., reproducibility) of measurements under specific conditions. It is particularly useful for assessing the reliability of performance assessments.
Using factor analysis and three independent samples, the authors concluded that modifying the original scale to only include 10-items would improve the validity of the scale. They deleted items that, theoretically, would make sense to include in a measure of resilience but that did not carry enough statistical weight to still be included (e.g ...
Classical test theory. Classical test theory (CTT) is a body of related psychometric theory that predicts outcomes of psychological testing such as the difficulty of items or the ability of test-takers. It is a theory of testing based on the idea that a person's observed or obtained score on a test is the sum of a true score (error-free score ...
Psychology portal. v. t. e. Human intelligence is the intellectual capability of humans, which is marked by complex cognitive feats and high levels of motivation and self-awareness. Using their intelligence, humans are able to learn, form concepts, understand, and apply logic and reason.
Three-stratum theory. The three-stratum theory is a theory of cognitive ability proposed by the American psychologist John Carroll in 1993. [1] [2] It is based on a factor-analytic study of the correlation of individual-difference variables from data such as psychological tests, school marks and competence ratings from more than 460 datasets.
Reliability theory shows that the variance of obtained scores is simply the sum of the variance of true scores plus the variance of errors of measurement. [7] This equation suggests that test scores vary as the result of two factors: 1. Variability in true scores. 2.