Inequality begets inequality: Income inequality and socioeconomic achievement gradients across the United States.

Social scientists have found income inequality is associated with an array of health and social problems, however the implications of income inequality for education are the subject of debate. Across 100 different areas (individual counties or collections of small counties) of the United States, we investigated how income inequality was associated with 1) average mathematics and reading achievement and 2) socioeconomic gradients in mathematics and reading achievement. Using data from the Kindergarten to Fifth Grade waves of the Early Childhood Longitudinal Study, Kindergarten Class of 2011 (ECLS-K 2011), we found areas of the United States with higher income inequality had lower average achievement in mathematics and a larger socioeconomic achievement gradient in reading.

Social costs to trying hard in high school: Differences by race-ethnicity.

There is debate whether social costs to trying hard in school are more widespread among black and Latino students than white or Asian students. Studies assessing a burden of "acting white" among black and Latino students have examined how the correlation between GPA and popularity or harassment varies across racial-ethnic groups. Yet, there has been little attention to whether students are aware of these costs or if social costs deter achievement.

The proportion of COVID-19 cases that are asymptomatic in South Korea: Comment on Nishiura et al.

The Korean Centers for Disease Control & Prevention reports the asymptomatic case proportion for COVID-19 is 33.3%. The asymptomatic case proportion in South Korea closely approximates the rate of 30.

Socioeconomic, Ethnic, Racial, and Gender Gaps in Children's Social/Behavioral Skills: Do They Grow Faster in School or out?

Children's social and behavioral skills vary considerably by socioeconomic status (SES), race and/or ethnicity, and gender, yet it is unclear to what degree these differences are due to school or nonschool factors. We observe how gaps in social and behavioral skills change during school and nonschool (summer) periods from the start of kindergarten entry until the end of second grade in a recent and nationally representative sample of more than 16,000 children (the Early Childhood Longitudinal Study Kindergarten Class of 2010-11). We find that large gaps in social and behavioral skills exist at the start of kindergarten entry, and these gaps favor high-SES, white, and female children.

Inequality in Reading and Math Skills Forms Mainly before Kindergarten: A Replication, and Partial Correction, of "Are Schools the Great Equalizer?".

When do children become unequal in reading and math skills? Some research claims that inequality grows mainly before school begins. Some research claims that schools cause inequality to grow. And some research-including the 2004 study "Are Schools the Great Equalizer?"-claims that inequality grows mainly during summer vacations.

From Kindergarten Through Second Grade, U.S. Children's Obesity Prevalence Grows Only During Summer Vacations.

Objective: To assess the relative importance of school and nonschool risk factors, this study estimated whether overweight and obesity prevalence grows faster during the school year or during summer vacation.

Methods: In the Early Childhood Longitudinal Study, Kindergarten Class of 2010-11, a nationally representative complex random sample of 18,170 U.S.

Intermediate peer contexts and educational outcomes: Do the friends of students' friends matter?

Sociologists of education have long been interested in the effects of peer relations on educational outcomes. Recent theory and research on adolescence suggest that peers on the boundaries of students' friendship networks may play an important role in shaping behaviors and educational outcomes. In this study, we examine the importance of a key "intermediate peer context" for students' outcomes: the friends of a student's friends.

The (Conditional) Resource Dilution Model: State- and Community-Level Modifications.

One of the most consistent patterns in the social sciences is the relationship between sibship size and educational outcomes: those with fewer siblings outperform those with many. The resource dilution (RD) model emphasizes the increasing division of parental resources within the nuclear family as the number of children grows, yet it fails to account for instances when the relationship between sibship size and education is often weak or even positive. To reconcile, we introduce a conditional resource dilution (CRD) model to acknowledge that nonparental investments might aid in children's development and condition the effect of siblings.

Dropping out of high school: Effects of close and distant friendships.

Prior research highlights the role of friends in influencing whether a student completes high school. Students who drop out tend to have fewer friends, as well as friends who are less oriented toward school success. We distinguish between close and distant friendships by developing a theoretical framework which predicts close and distant friends likely have distinct effects on dropping out.