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Direct linkGoodwin, Amanda P.; Petscher, Yaacov; Carlisle, Joanne F.; Mitchell, Alison M. – Journal of Research in Reading, 2017
This study examined the dimensionality of morphological knowledge. The performance of 371 seventh- and eighth-graders on seven morphological knowledge tasks was investigated using confirmatory factor analysis. Results suggested that morphological knowledge was best fit by a bifactor model with a general factor of morphological knowledge and seven…
Descriptors: Morphology (Languages), Grade 7, Grade 8, Factor Analysis
Reed, Deborah K.; Petscher, Yaacov; Foorman, Barbara R. – Reading and Writing: An Interdisciplinary Journal, 2016
This study examined the contributions of vocabulary and spelling to the reading comprehension of students in grades 6-10 who were and were not classified as English language learners. Results indicate that vocabulary accounted for greater between-grade differences and unique variance (?R[superscript 2] = 0.11-0.31) in comprehension as compared to…
Descriptors: Vocabulary, Spelling, Reading Comprehension, Grade 6
Reed, Deborah K.; Vaughn, Sharon; Petscher, Yaacov – Learning Disability Quarterly, 2012
In this study, the authors examined the validity of a holistically scored retell within a confirmatory factor analysis framework by comparing the fit of a three-factor model of reading with the data from a diverse sample of seventh and eighth graders. The final model demonstrated adequate fit, [chi][squared](32) = 97.316; comparative fit index =…
Descriptors: Factor Analysis, Validity, Reading Comprehension, Grade 8
