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| Titel: |
Sample Exclusion and Student Attrition Effects in the Longitudinal Study of Middle School Mathematics Performance |
| Auteur: |
Zvoch, Keith Stevens, Joseph J. |
| Verschenen in: |
Educational assessment |
| Paginering: | Jaargang 10 (2005) nr. 2 pagina's 105-123 |
| Jaar: |
2005-05-01 |
| Inhoud: |
Achievement data from a longitudinally matched student cohort from a large school district in the southwestern United States were analyzed to investigate sample exclusion and student attrition effects on estimates of student, school, and district mathematics performance. Use of 2- and 3-level longitudinal growth models to estimate the growth trajectories of middle school students revealed that mathematics performance differed across 2 sample conditions. Relative to the achievement outcomes associated with a sample that included all students from the longitudinal cohort, district and school achievement were generally higher and student group performance more similar in the smaller, more advantaged student sample used for district accountability reporting. Further investigation of the school performance estimates showed that cross-sample changes in student achievement outcomes were closely related to the proportion of students from special student populations who were excluded from the district accountability sample. The achievement differences and the differential patterns of association demonstrated in this study suggest that conclusions drawn about district and school performance and relationships between student characteristics and student achievement outcomes may depend to some degree on which students are included in an analytic sample. Investigators seeking to take advantage of longitudinal designs in school effectiveness research are cautioned to closely examine their data for nonrandom student attrition and document the impact of sample exclusion and student attrition effects in the research and accountability reports that are produced from longitudinal data sets. |
| Uitgever: |
Routledge |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 2 van 3 gevonden artikelen
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