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Ranger, Jochen; Kuhn, Jorg-Tobias – Journal of Educational and Behavioral Statistics, 2013
It is common practice to log-transform response times before analyzing them with standard factor analytical methods. However, sometimes the log-transformation is not capable of linearizing the relation between the response times and the latent traits. Therefore, a more general approach to response time analysis is proposed in the current…
Descriptors: Item Response Theory, Simulation, Reaction Time, Least Squares Statistics
Schochet, Peter Z. – Journal of Educational and Behavioral Statistics, 2011
For RCTs of education interventions, it is often of interest to estimate associations between student and mediating teacher practice outcomes, to examine the extent to which the study's conceptual model is supported by the data, and to identify specific mediators that are most associated with student learning. This article develops statistical…
Descriptors: Least Squares Statistics, Intervention, Academic Achievement, Correlation
Cai, Li; Hayes, Andrew F. – Journal of Educational and Behavioral Statistics, 2008
When the errors in an ordinary least squares (OLS) regression model are heteroscedastic, hypothesis tests involving the regression coefficients can have Type I error rates that are far from the nominal significance level. Asymptotically, this problem can be rectified with the use of a heteroscedasticity-consistent covariance matrix (HCCM)…
Descriptors: Least Squares Statistics, Error Patterns, Error Correction, Computation
Candel, Math J. J. M.; Winkens, Bjorn – Journal of Educational and Behavioral Statistics, 2003
Multilevel analysis is a useful technique for analyzing longitudinal data. To describe a person's development across time, the quality of the estimates of the random coefficients, which relate time to individual changes in a relevant dependent variable, is of importance. The present study compares three estimators of the random coefficients: the…
Descriptors: Monte Carlo Methods, Least Squares Statistics, Computation, Longitudinal Studies