Abstract
A model of the effects of economic level and ethnicity on grade 8 mathematics scores both within and between schools found that both the economic composition and the ethnic composition of a school were directly related to the effectiveness of that school. Projection of the data suggests that if the nation's schools were completely desegregated economically (but not at all ethnically), the test-score gap between free lunch students and students paying full price for lunch would decline by 25 %. Ethnic compositional effects for black, Asian/Pacific Islander (API), and Hispanic students were reversed from their within-school effects, with positive effects for students in schools with larger proportions of black and Hispanic students and a strong negative effect for students in schools with larger proportions of Asian/Pacific Islander students.
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Notes
We follow Asa Hilliard III (2001) in preferring the word “ethnicity” to the compound word “race/ethnicity” used by some other researchers.
Compositional effects are sometimes known as contextual effects. We follow Willms (2006) in reserving the term “contextual” effects to refer to factors describing “the physical features of the learning environment and its culture.”
Just as an average national household can have 2.6 members even though no household can possible have exactly that number of members, so can a hypothetical nationally average student be about 2 % Indian, 10 % Hispanic, 15 % Black, 3 % Asian, and 70 % White and Other, according to the estimations of this NAEP dataset. This national average student would have a score of .39 on the free lunch scale, slightly above the reduced-price lunch income level. This nationally-average student would be poorer than the average student in a wealthy school and wealthier than the average student in a poor school. By focusing on this nationally average student, two-level analysis allows us to analyze school effects without confusing them with student characteristics. This analysis cannot substitute for analyses that look carefully at the effects of schools on very particular groups of students, but it is ideal for looking at the overall effects of school segregation on students.
Using mathematical language, Willms (2006) calls socioeconomic total effects the “overall socioeconomic gradient slope;” Sirin (2005) and White (1982) call them “student-level” effects because they are based on the student as the single level of analysis, but we prefer the language of Raudenbush and Bryk (2002, figure 5.1) – total effects, because they represent the total effect of socioeconomic status on student test scores in a given society.
There are many ways to estimate total effects, between-school effects, and within-school effects. For details, the reader is referred to Willms (2006), Raudenbush and Bryk (2002), and Snijders and Bosker (2000). All of these sources assume that the school-level variables are aggregates of the student-level variables, and are thus using the same scale. They also describe the importance of centering in the estimation of between and composition effects. We use grand-mean centering, but identical results can be found using group-mean centering. Equation (2) can be found on page 50 of Willms, as equation 5.38 of Raudenbush and Bryk, and as equation 3.28 of Snijders and Bosker. Snijders and Bosker make clear that estimations of this equation provide exact results when the number of students in each school is the same; when the data set is not balanced in this way, the two sides of the equation may not balance exactly.
Willms’ data sources were the Progress in International Reading Literacy Study (PIRLS) and the Programme for International Student Assessment (PISA).
Future analyses building on the analysis in this paper can and should add school sector as part of an elaborated structural equation model in order to investigate whether access to private schooling is part of the mechanism leading to unequal results for children based on their economic level and race/ethnicity.
Of the 6,334 schools in the NAEP schools dataset, 193 are not included in the national sample. The schools and students dataset are best combined using SCHID as the variable that links the two datasets. This is the correct choice, not SCRPSU, despite the fact that SCRPSU is the variable recommended for this purpose by section 5.6 of the NAEP Data Companion (Rogers & Stoeckel, 2004). In the 2003 Mathematics dataset, some schools share SCRPSU ids. SCHID, on the other hand, is unique. Per NCES policy, this report rounds unweighted sample size numbers to the nearest ten to prevent disclosure of student identity.
As of 2011, the NAEP ethnic categories were changed and now reflect Asian as its own group, with Native Hawaiian and other Pacific Islanders as a separate group. Unfortunately, this advantage for more recent data is outweighed for researchers by the loss of many important covariates in the reduced-size student and teacher surveys.
It is important to note that this estimate makes two simplifying assumptions: one is that the results of desegregation would be linear, even at the extremes; the other is that economic desegregation could be accomplished without accompanying ethnic desegregation.
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This article was made possible by the generous support of Dr. and Mrs. Thomas Royster, through the Royster Fellows program at the University of North Carolina - Chapel Hill. Address correspondence to Tom Munk, Westat, Inc., 1009 Slater Road, Durham, NC 27703-8446; e-mail: tommunk@westat.com.
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Munk, T.E., McMillian, M.M. & Lewis, N.R. Compositional Effects, Segregation and Test Scores: Evidence From the National Assessment of Educational Progress. Rev Black Polit Econ 41, 433–454 (2014). https://doi.org/10.1007/s12114-014-9200-3
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DOI: https://doi.org/10.1007/s12114-014-9200-3