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Green, Samuel; Xu, Yuning; Thompson, Marilyn S. – Educational and Psychological Measurement, 2018
Parallel analysis (PA) assesses the number of factors in exploratory factor analysis. Traditionally PA compares the eigenvalues for a sample correlation matrix with the eigenvalues for correlation matrices for 100 comparison datasets generated such that the variables are independent, but this approach uses the wrong reference distribution. The…
Descriptors: Factor Analysis, Accuracy, Statistical Distributions, Comparative Analysis
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Johnson, 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
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Barth, Amy E.; Stuebing, Karla K.; Fletcher, Jack M.; Denton, Carolyn A.; Vaughn, Sharon; Francis, David – Assessment for Effective Intervention, 2014
We evaluated the technical adequacy of oral reading fluency (ORF) probes in which 1,472 middle school students with and without reading difficulties read fluency probes for 60 s versus reading the full passage. Results suggested that the reliability of 60-s probes (rs = 0.75) was not substantively different than full passage probes (rs = 0.77)…
Descriptors: Middle School Students, Reading Fluency, Reading Tests, Reading Difficulties
Hedges, Larry V.; Pustejovsky, James E.; Shadish, William R. – Online Submission, 2012
Single case designs are a set of research methods for evaluating treatment effects by assigning different treatments to the same individual and measuring outcomes over time and are used across fields such as behavior analysis, clinical psychology, special education, and medicine. Emerging standards for single case designs have focused attention on…
Descriptors: Research Design, Effect Size, Meta Analysis, Computation
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Stambaugh, Laura A. – Psychology of Music, 2013
The purpose of this study was to investigate the effects of cognitive load during practice on university wind students' learning. Cognitive load was manipulated through instrument family (woodwind or brass) and the amount of repetition used in practice (highly repetitive or random). University woodwind and valved-brass students (N = 46)…
Descriptors: Undergraduate Students, Cognitive Processes, Difficulty Level, Musical Instruments
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Niedo, Jasmin; Lee, Yen-Ling; Breznitz, Zvia; Berninger, Virginia W. – Learning Disability Quarterly, 2014
Fourth graders whose silent word reading and/or sentence reading rate was, on average, two-thirds standard deviation below their oral reading of real and pseudowords and reading comprehension accuracy were randomly assigned to treatment ("n" = 7) or wait-listed ("n" = 7) control groups. Following nine sessions combining…
Descriptors: At Risk Students, Reading Rate, Silent Reading, Statistical Distributions