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Perlman, Carole L. – 1982
The value-added model is presented as a method of assessing the impact of treatments in pretest-posttest quasi-experimental designs. The model yields a projection of treatment group performance at posttest time with no special treatment. The difference between the expected result and the actual outcome is "the value added," a measure of…
Descriptors: Achievement Gains, Age Differences, Early Childhood Education, Evaluation Methods
Download full textHenry, Gary T.; Gordon, Craig S.; Mashburn, Andrew; Ponder, Bentley D. – 2001
The Georgia Prekindergarten Program was established in 1993 to provide the state's 4-year-olds with high-quality preschool experiences. A five-year, longitudinal study examined the ways in which differences in prekindergarten services received by 3,639 Pre-K 4-year-olds affected them during their first 3 years of elementary school and assessed the…
Descriptors: Academic Achievement, Age Differences, Age Grade Placement, Elementary School Students
System Development Corp., Santa Monica, CA. – 1972
The second of two reports on a national evaluation of the immediate effects of Project Head Start describes the characteristics of children, families and programs in samples of full-year classes operating in 1966-67 and 1967-68. No control groups were used; comparisons were made within the Head Start sample to see what kinds of classroom…
Descriptors: Achievement Gains, Affective Measures, Age Differences, Classroom Observation Techniques
System Development Corp., Santa Monica, CA. – 1972
The first of two reports of a national evaluation of the immediate effects of Project Head Start describes the characteristics of children, families and programs in samples of full-year classes operating in 1968-69. The study identifies changes associated with Head Start participation and the conditions under which these changes were greatest. No…
Descriptors: Achievement Gains, Affective Measures, Age Differences, Classroom Observation Techniques
