Seth Gershenson

Who Believes in Me? The Effect of Student-Teacher Demographic Match on Teacher Expectations

Teachers are an important source of information for traditionally disadvantaged students. However, little is known about how teachers form expectations and whether they are systematically biased. We investigate whether student-teacher demographic mismatch affects high school teachers’ expectations for students’ educational attainment. Using a student fixed effects strategy that exploits expectations data from two teachers per student, we find that non-black teachers of black students have significantly lower expectations than do black teachers. These effects are larger for black male students and math teachers. Our findings add to a growing literature on the role of limited information in perpetuating educational attainment gaps.

Do Summer Time-Use Gaps Vary by Socioeconomic Status?

Several scholars have suggested that differential rates of summer learning loss contribute to the persistence of achievement gaps between students of different socioeconomic backgrounds. To better understand the possible determinants of summer learning loss, a test for summer-specific differences by socioeconomic status (SES) in children’s time spent in activities related to cognitive development and parental time spent interacting with children is conducted using data from two time-diary surveys: the Activity Pattern Survey of California Children and the American Time Use Study. Tobit-model estimates provide evidence of statistically and practically significant summer-SES time-use gaps, most notably in children’s television viewing.

Are Student Absences Worth the Worry in U.S. Primary Schools

Student absences are a potentially important, yet understudied, input in the educational process. Using longitudinal data from a nationally representative survey and rich administrative records from North Carolina, we investigate the relationship between student absences and academic performance. Generally, student absences are associated with modest but statistically significant decreases in academic achievement. The harmful effects of absences are approximately linear, and are two to three times larger among fourth and fifth graders in North Carolina than among kindergarten and first-grade students in the nationally representative Early Childhood Longitudinal Study. In both datasets, absences similarly reduce achievement in urban, rural, and suburban schools. In North Carolina, the harm associated with student absences is greater among both low-income students and English language learners, particularly for reading achievement. Also, in North Carolina, unexcused absences are twice as harmful as excused absences. Policy implications and directions for future research are discussed.

Linking Teacher Quality, Student Attendance, and Student Achievement

Research on the effectiveness of educational inputs, particularly research on teacher effectiveness, typically overlooks teachers’ potential impact on behavioral outcomes, such as student attendance. Using longitudinal data on teachers and students in North Carolina I estimate teacher effects on primary school student absences in a value-added framework. The analysis yields two main findings: First, teachers have arguably causal, statistically significant effects on student absences that persist over time. Second, teachers who improve test scores do not necessarily improve student attendance, suggesting that effective teaching is multidimensional and teachers who are effective in one domain are not necessarily effective in others.

The Effect of Primary School Size on Academic Achievement.

Evidence on optimal school size is mixed. We estimate the effect of transitory changes in school size on the academic achievement of fourth- and fifth-grade students in North Carolina using student-level longitudinal administrative data. Estimates of value-added models that condition on school-specific linear time trends and a variety of teacher-by-school, student, and school-by-year fixed effects suggest that, on average, there is no causal relationship between school size and academic performance. However, two subgroups of interest are significantly harmed by school size: socioeconomically disadvantaged students and students with learning disabilities. The largest effects are observed among students with learning disabilities: A 10-student increase in grade size is found to decrease their math and reading achievement by about 0.015 test-score standard deviations.

Gender Gaps in High School Students’ Homework Time

Gender differences in human capital investments made outside of the traditional school day suggest that males and females consume, respond to, and form habits relating to education differently. We document robust, statistically significant one-hour weekly gender gaps in secondary students’ non-school study time using time diary data from the 2003–2012 waves of the American Time Use Survey (ATUS) and transcript data from the Educational Longitudinal Study of 2002 (ELS). These complementary data sets provide consistent evidence of gender gaps that favor females and are not explained by gender differences in after-school time use, parental involvement, educational expectations, course taking, past academic achievement, or cognitive ability.

The Implications of Summer Learning Loss for Value-Added Estimates of Teacher Effectiveness

States and school districts across the United States are increasingly using value-added models (VAMs) to evaluate teachers. In practice, VAMs typically rely on lagged test scores from the previous academic year, which necessarily conflate summer learning with school-year gains. These “cross-year” VAMs yield biased estimates of teacher effectiveness when students with different propensities for summer learning are non-randomly assigned to classrooms. We investigate the practical implications of this problem by comparing estimates from “cross-year” VAMs to those from arguably more valid “within-year” VAMs using fall and spring test scores from the nationally representative Early Childhood Longitudinal Study – Kindergarten Cohort (ECLS-K). “Cross-year” and “within-year” VAMs frequently yield significant differences that remain even after conditioning on children’s summer activities.

The Effect of Community Traumatic Events on Student Achievement: Evidence from the Beltway Sniper Attacks

Community traumatic events such as mass shootings, terrorist attacks, and natural disasters have the potential to disrupt student learning. For example, these events can reduce instructional time by causing teacher and student absences, school closures, and disturbances to classroom and home routines. This paper uses a quasi-experimental research design to identify the effects of the 2002 “Beltway Sniper” attacks on student achievement in Virginias public elementary schools. To identify the causal impact of these events, the empirical analysis uses a difference-in-differences strategy that exploits geographic variation in schools’ proximity to the attacks. The main results indicate that the attacks significantly reduced school-level proficiency rates in schools within five miles of an attack. Evidence of a causal effect is most robust for math proficiency rates in the third and fifth grades, and third-grade reading proficiency, suggesting that the shootings caused a decline in school proficiency rates of about 2 to 5 percent. Particularly concerning from an equity standpoint, these effects appear to be entirely driven by achievement declines in schools that serve higher proportions of racial minority and socioeconomically disadvantaged students. Finally, results from supplementary analyses suggest these deleterious effects faded out in subsequent years.

The Summer Learning of Exceptional Students

The summer activities and summer learning of exceptional students—students who have an individualized education plan or who are English-language learners—are potentially important yet understudied. We analyze nationally representative survey data to fill this gap. Exceptional students are significantly less likely than their mainstream counterparts to participate in organized summer activities and summer day care but are more likely to attend summer school and to practice math with a parent. Exceptional learners make significantly greater reading gains during the summer vacation than their mainstream counterparts; however, this is true only for middle- and high-income exceptional learners. Moreover, the well-documented summer learning loss of low-income students in reading appears to be entirely driven by lower summer learning rates of low-income exceptional learners. There are no such differences in math achievement.

Re-Conceptualizing Gaps by Socioeconomic Status in Parental Time with Children

Differences in the total time that parents spend with their children by socioeconomic status (SES) are well documented. However, the qualitative aspects of such gaps are potentially important, yet relatively understudied. The current study analyzes time-use data for a nationally representative sample of married households with at least two children, one of whom is under 13 (N = 21,016), from the American Time Use Survey to provide a more nuanced analysis of previously documented differences in the time parents spend with children by SES. Specifically, two understudied aspects of family time are considered, both of which are distinct from other types of parent–child time and are potentially particularly developmentally beneficial: shared time when both parents are present with a child and individual child time when no siblings are present. We find that shared time when both parents are simultaneously present with a child often comprises a substantial portion of the total gap in parental time spent with children between college-educated parents and parents who did not complete high school. Similarly, college-educated parents spend more time with children in the absence of the child’s siblings than do less-educated parents. Gaps in this time classification are often found within enriching time, which is likely especially developmentally beneficial, potentially amplifying the effects of these gaps on child development. Generally, these results suggest that gaps in parental time with children by SES are more nuanced than previous research has recognized.