North Carolina
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CALDER Authors Related Publications
Does differential access to computer technology at home compound the educational disparities between the rich and the poor? Would a program of government provision of computers to early secondary school students reduce these disparities? This study covers years 2000 to 2005, a period when home computers and high-speed Internet access expanded dramatically. Using administrative data on North Carolina public school students to corroborate earlier surveys that document broad racial and socioeconomic gaps in home computer access and use, the authors compared the children's reading and math scores before and after they acquired a home computer, and compared these scores to those of peers who had a home computer by fifth grade and to test scores of students who never acquired a home computer. The introduction of home computer technology is associated with modest but statistically significant and persistent negative impacts on student math and reading test scores. The authors also conclude that home computers are put to more productive use in households where parental monitoring is more effective. Further evidence suggests that providing universal access to home computers and high-speed internet access would broaden, rather than narrow, math and reading achievement gaps. Published: June 2010 | Download:
Research has consistently shown that teacher quality is distributed very unevenly among schools to the clear disadvantage of minority students and those from low-income families. Using information on teaching spells in North Carolina, the authors examine the potential for using salary differentials to overcome this pattern. They conclude that salary differentials are a far less effective tool for retaining teachers with strong pre-service qualifications than for retaining other teachers in schools with high proportions of minority students. Consequently, large salary differences would be needed to level the playing field when schools are segregated. This conclusion reflects the finding that teachers with stronger qualifications are both more responsive to the racial and socioeconomic mix of a school's students and less responsive to salary than are their less well qualified counterparts when making decisions about remaining in their current school, moving to another school or district, or leaving the teaching profession. Published: May 2010 | Download:
The gold standard in making causal inference on program effects is a randomized trial. Most randomization designs in education randomize classrooms or schools rather than individual students. Such "clustered randomization" designs have one principal drawback: They tend to have limited statistical power or precision. This study aims to provide empirical information needed to design adequately powered studies that randomize schools using data from Florida and North Carolina. The authors assess how different covariates contribute to improving the statistical power of a randomization design and examine differences between math and reading tests; differences between test types (curriculum-referenced tests versus norm-referenced tests); and differences between elementary school and secondary school, to see if the test subject, test type, or grade level makes a large difference in the crucial design parameters. Finally they assess bias in 2-level models that ignore the clustering of students in classrooms. Published: May 2010 | Download:
This study presents a generalization to the standard career concerns model and applies it to the public teacher labor market. The model predicts optimal teacher effort levels decline with both tenure at a school and experience, all things being equal. Using administrative data from North Carolina spanning 14 school years through 2008, the author finds significant changes in teacher sick leave consistent with the generalized career concerns model. By exploiting exogenous variation in career concerns in the form of principal turnover, the author shows the observed behaviors cannot be due to the endogeneity of teacher mobility decisions alone. Also examined are the effects of career concerns incentives breaking down. There is evidence suggestive of teacher shirking, and evidence on an unobservable measure of effort taken from the Schools and Staffing Survey that corroborates findings from observable teacher absence behavior. In sum,teachers exert considerable discretion over their own effort levels in response to these incentives.This has important policy implications. Published: December 2009 | Download:
This study uses data from North Carolina to examine the extent to which survey based perceptions of working conditions are predictive of policy-relevant outcomes, independent of other school characteristics such as the demographic mix of the school's students. Working conditions emerge as highly predictive of teachers' stated intentions to remain in or leave their schools, with leadership emerging as the most salient dimension. Teachers' perceptions of their working conditions are also predictive of one-year actual departure rates and student achievement, but the predictive power isfar lower. These weaker findings for actual outcome measures help to highlight both the strengths and weaknesses of using teacher survey data for understanding outcomes of policy interest. Published: December 2009 | Download:
Reforming teacher tenure is an idea that appears to be gaining traction with the underlying assumption being that one can infer to a reasonable degree how well a teacher will perform over her career based on estimates of her early-career effectiveness. Here we explore the potential for using value-added models to estimate performance and inform tenure decisions. We find little evidence that the variation of teacher effects change over teacher careers, but strong evidence that prior year estimates of job performance predict student achievement, even when there is a multi-year lag between the two. Last revised: February 2010 | Download:
Most studies that have fueled alarm over the attrition and mobility rates of teachers have relied on proxy indicators of teacher quality, even though these proxies correlate only weakly with student performance. This paper examines the attrition and mobility of early-career teachers of varying quality using value-added measures of teacher performance. Unlike previous studies, this paper focuses on the variation in these effects across the effectiveness distribution. On average, more effective teachers tend to stay in their initial schools and in teaching. But the lowest performing teachers, who are generally the most likely to transfer between schools, appear to "churn" within the system, and teacher mobility appears significantly affected by student demographics and achievement levels. Published: August 2009 | Download:
Do charter schools draw good teachers from traditional, mainstream public schools? Using an eleven-year panel of North Carolina public school teachers, the author finds nuanced patterns of teacher quality flowing into charter schools. High rates of inexperienced and unlicensed teachers moved to charter schools, but among regularly licensed teachers changing schools, charter movers had higher licensure test scores than other moving teachers, and they were more likely to be highly experienced. The author estimates measures of value added for a subset of elementary teachers and show that charter movers were less effective than other mobile teachers and colleagues within their sending schools, by 3 to 4 percent of a student-level standard deviation in achievement. Last Revised: June 2010 | Download:
Using detailed data from North Carolina, this paper examines the frequency, incidence, and consequences of teacher absences in public schools, as well as the impact of a policy designed to reduce absences. The incidence of teacher absences is regressive: when schools are ranked by the fraction of students receiving free or reduced-price lunch, schools in the poorest quartile averaged almost one extra sick day per teacher than schools in the highest income quartile, and schools with persistently high rates of teacher absence were much more likely to serve low-income than high-income students. In regression models incorporating teacher fixed effects, absences are associated with lower student achievement in elementary grades. There is evidence that the demand for discretionary absences is price-elastic. Our estimates suggest that a policy intervention that simultaneously raised teacher base salaries and broadened financial penalties for absences could both raise teachers' expected income and lower districts' expected costs. Published: April 2009 | Download:
This paper describes the school mobility rates for elementary and middle school students in North Carolina and attempts to estimate the effect of school mobility on the performance of different groups of students using student fixed effects models. School mobility is defined as changing schools at times that are non-promotional (e.g., moving from middle to high school). We used detailed administrative data on North Carolina students and schools from 1996 to 2005 and followed four cohorts of 3rd graders for six years each. School mobility rates were highest for minority and disadvantaged students. School mobility rates for Hispanic students declined across successive cohorts, but increased for Black students. Findings on effects were most pronounced in math. School mobility hurt the math performance of Black and Hispanic students, but not the math performance of white students. School mobility improved the reading performance of white and more advantaged students, but had no effect on the reading performance of minority students. "Strategic" school moves (cross-district) benefitted or had no effect on student performance, but "reactive" moves (within district) hurt all groups of students. White and Hispanic students were more likely to move to a higher quality school while Blacks were more likely to move to a lower quality school. The negative effects of school mobility increased with the number of school moves. Published: March 2009 | Download:
No Child Left Behind judges the effectiveness of schools based on their students' achievement status. However, many policy analysts argue that schools should be measured, instead, by their students' achievement growth. Using a ten-year student-level panel dataset from North Carolina, we examine how school-specific pressure related to two school accountability approaches (status and growth) affects student achievement at different points in the prior-year achievement distribution. Achievement gains for students below the proficiency cut point emerge in response to both types of accountability systems. We find little or no evidence that schools in North Carolina ignore students far below proficiency under either approach. Importantly, we find that the status, but not the growth, approach reduces the reading achievement of higher performing students, with the losses in the aggregate exceeding the gains at the bottom. The distributional effects of accountability pressure depend on the type of pressure for which schools are held accountable and the tested subject. Published: March 2009 | Download: Making a Difference?: The Effects of Teach for America in High School Teach for America (TFA) selects and places graduates from the most competitive colleges as teachers in the lowest-performing schools in the country. This paper is the first study that examines TFA effects in high school. We use rich longitudinal data from North Carolina and estimate TFA effects through cross-subject student and school fixed-effects models. We find that TFA teachers tend to have a positive effect on high school student test scores relative to non-TFA teachers, including those who are certified in-field. Such effects exceed the impact of additional years of experience and are particularly strong in math and science. Last Revised: March 2009 | Download:
This paper uses administrative data for the public K-12 schools of North Carolina to measure racial segregation in the public schools of North Carolina. Using data for the 2005/06 school year, the authors update previous calculations that measure segregation in terms of unevenness in racial enrollment patterns both between schools and within schools. They find that classroom segregation generally increased between 2000/01 and 2005/06, continuing, albeit at a slightly slower rate, the trend observed over the preceding six years. Segregation increased sharply in Charlotte-Mecklenburg, which introduced a new choice plan in 2002. Over the same period, racial and economic disparities in teacher quality widened in that district. Published: February 2008 | Download:
Since the 1996/97 school year, North Carolina has awarded bonuses of up to $1,500 to teachers in schools that exhibit test score gains above certain thresholds. This article reviews the details of the bonus program, describes patterns of differences between schools that qualify for bonuses of differing amounts, and presents basic data to address the question of whether the bonus program has improved student achievement, or has led to a narrowing of racial or socioeconomic achievement gaps. There is some evidence to suggest an improvement in overall test scores, particularly in math, but less evidence to suggest that achievement gaps have narrowed. Published: February 2008 | Download:
This paper uses evidence from Durham, North Carolina to examine the impact of school choice on racial and class-based segregation across schools. The findings suggest that school choice increases segregation. Furthermore, the effects of choice on segregation by class are larger than the effects on segregation by race. These results are consistent with the theoretical argument—developed in sociology and economics literature—that the segregating choices of students from advantaged backgrounds are likely to outweigh any integrating choices by disadvantaged students. Published: February 2008 | Download:
Most studies that have fueled alarm over the attrition and mobility rates of high-quality teachers have relied on proxy indicators of teacher quality, which recent research finds to be only weakly correlated with value-added measures of teachers' performance. We examine attrition and mobility of teachers using teacher value-added measures for early-career teachers in North Carolina public schools from 1996 to 2002. Our findings suggest that the most-effective teachers tend to stay in teaching and in specific schools. Contrary to common expectations, we do not find that more-effective teachers are more likely to leave more-challenging schools. Published: October 2007 | Download:
One of the first papers to ever estimate teacher effects at the secondary school level, this groundbreaking work presents evidence that teacher credentials affect secondary school student success in systematic ways and to a significant, policy-relevant extent. We use data on statewide end-of-course tests in North Carolina to examine the relationship between teacher credentials and student achievement at the high school level. We find compelling evidence that teacher credentials affect student achievement in systematic ways and that the magnitudes are large enough to be policy relevant. As a result, the uneven distribution of teacher credentials by race and socio-economic status of high school students--a pattern we also document--contributes to achievement gaps in high school. Published: October 2007 | Download:
This paper explores the relationship between teacher testing and teacher effectiveness using a unique dataset that links teachers to their individual students. My findings show a positive relationship between some teacher licensure tests and student achievement. But they also suggest that states face significant tradeoffs when they require particular performance levels as a precondition to becoming a teacher: some teachers whom we might wish were not in the teacher workforce based on their contribution toward student achievement are eligible to teach based on their performance on these tests, while other individuals who would be effective teachers are ineligible. Published: April 2007 | Download:
In this paper, the authors use a ten-year span of longitudinal data from North Carolina to explore a range of questions related to the relationship between teacher characteristics and credentials, on the one hand, and student achievement on the other. They conclude that a teacher's experience, test scores and regular licensure all have positive effects on student achievement, with larger effects for math than for reading. Taken together the various teacher credentials exhibit quite large effects on math achievement, whether compared to the effects of changes in class size or to the socio-economics characteristics of students. Published: March 2007 | Download: Read commentary on this working paper by Mary Dilworth of the NBPTS, Daniel McCaffrey of the RAND Corporation, and CALDER researchers, Helen F. Ladd and Tim R. Sass
The central question for this study is how the quality of the teachers and principals in high poverty schools in North Carolina compares to that in the schools serving more advantaged students. A related question is why these differences emerge. The consistency of the patterns across many measures of qualifications for both teachers and principals leaves no doubt that students in the high poverty schools are served by school personnel with lower qualifications than those in the lower poverty schools. Moreover, in many cases the differences are large. Additional evidence documents that the differences largely reflect predictable outcomes of the labor market for teachers and principals. Published: March 2007 | Download:
Race to the Top encourages states to adopt policies that measure the impact of individual teachers on student learning and use those measures to inform human capital decisions including tenure and compensation. As a number of states begin to revamp their tenure-granting policies, the idea that high-stakes personnel decisions need to be linked to direct measures of teacher effectiveness is gaining traction among education policymakers. Contributing to the debate about policies that can enhance the quality of teachers, this brief evaluates how well early-career performance signals teacher effectiveness after tenure. Published: May 2010 | Download:
Using individual teacher and student-level longitudinal data from North Carolina, this research brief presents selected findings from work examining the stability of value-added model estimates of teacher effectiveness, focusing on their implication for teacher tenure policies and making high stakes personnel decisions. Findings show year-to-year correlations in teacher effects are modest, but pre-tenure estimates of teacher job performance do predict estimated post-tenure performance in both math and reading, and would therefore seem to be a reasonable metric to use as a factor in making substantive teacher selection decisions. Published: November 2008 | Download:
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