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Direct linkRojas, Raul; Iglesias, Aquiles – Child Development, 2013
Although the research literature regarding language growth trajectories is burgeoning, the shape and direction of English Language Learners' (ELLs) language growth trajectories are largely not known. This study used growth curve modeling to determine the shape of ELLs' language growth trajectories across 12,248 oral narrative language samples…
Descriptors: English Language Learners, Spanish Speaking, Second Language Learning, Oral Language
Kim, Jinok; Seltzer, Michael – Psychological Methods, 2011
Individual differences in response to treatments have been a long-standing interest in education, psychology, and related fields. This article presents a conceptual framework and hierarchical modeling strategies that may help identify the subgroups for whom, or the conditions under which, a particular treatment is associated with better outcomes.…
Descriptors: Individual Differences, Statistical Analysis, Models, Experimental Groups
Download full textSeltzer, Michael; Kim, Jinok – National Center for Research on Evaluation, Standards, and Student Testing (CRESST), 2007
Individual differences in response to a given treatment have been a longstanding interest in education. While many evaluation studies focus on average treatment effects (i.e., the effects of treatments on the levels of outcomes of interest), this paper additionally considers estimating the effects of treatments on the dispersion in outcomes.…
Descriptors: Individual Characteristics, Mathematics Instruction, Inferences, Conventional Instruction
