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Direct linkJohnson, Wendy; Deary, Ian J.; Bouchard, Thomas J., Jr. – Educational and Psychological Measurement, 2018
Most study samples show less variability in key variables than do their source populations due most often to indirect selection into study participation associated with a wide range of personal and circumstantial characteristics. Formulas exist to correct the distortions of population-level correlations created. Formula accuracy has been tested…
Descriptors: Correlation, Sampling, Statistical Distributions, Accuracy
Download full textKim, Donghoh; Kim, Se-Kang; Park, Soyeon – Universal Journal of Educational Research, 2015
Recently, MDS has been utilized to identify and evaluate cognitive ability latent profiles in a population. However, dimension coordinates do not carry any statistical properties. To cope with statistical incompetence of MDS, we investigated the common aspects of various studies utilizing bootstrapping, and provided an R function for its…
Descriptors: Multidimensional Scaling, Sampling, Statistical Inference, Cognitive Ability
Schulz, Wolfram, Ed.; Ainley, John, Ed.; Fraillon, Julian, Ed. – International Association for the Evaluation of Educational Achievement, 2011
This report is structured so as to provide technical detail about each aspect of International Civic and Citizenship Education Study (ICCS). The overview is followed by a series of chapters that provide detail about different aspects of ICCS. Chapters, 2, 3, 4, and 5 are concerned with the instruments. Chapter 2 provides information about the…
Descriptors: Foreign Countries, Civics, Citizenship Education, Cognitive Tests
