Because studies examining youth drug use often have data with a high proportion of zeros, they often do not meet the assumptions for univariate or linear regression analyses that are typically used. We demonstrate the use of zero-inflated negative binomial regression models to address excessive zeros in drug use frequency on perceptions of…

This quantitative correlational-predictive study addressed the predictive relationships of County Political Leaning (Republican vs. Democratic/reference) and Poverty of Student Population (operationalized as percentage of students enrolled in Free and Reduced Price Lunch programs) with Out-of-school Suspension in public high schools in California.…

Few studies holistically examine how students experience the multiple dimensions of school climate and resilience promoting characteristics, or how these two constructs may be interrelated. This study utilised a sample of 78,550 7th, 9th, and 11th grade students in California. Roughly half of the participants were female (52%), and roughly half…

Using rich administrative data from the California Community Colleges Chancellor's Office that tracks each student longitudinally, this analysis examines how the onset of the pandemic affected student enrollment duration. Data are disaggregated by student characteristics and college campuses in order to understand variable impacts and equity…

This study examines the effects of English Learner (EL) status on subsequent Special Education (SPED) placement. Through a research-practice partnership, we link student demographic data and initial English proficiency assessment data across seven cohorts of test takers and observe EL and SPED programmatic participation for these students over 7…

This study explores the demographic/background, academic, and environmental factors that predicted student retention after stopping out at a large Hispanic-serving institution in Southern California. The results show that (a) gender, (b) academic background, experience, readiness, and performance, and (c) personal and financial issues predicted…

Noncognitive constructs such as self-efficacy, social awareness, and academic engagement are widely acknowledged as critical components of human capital, but systematic data collection on such skills in school systems is complicated by conceptual ambiguities, measurement challenges and resource constraints. This study addresses this issue by…

To evaluate the net effects of classroom disciplinary practices, policy makers and educators must understand not only their effects on disciplined students but also their effects on non-disciplined peers. In this study, we estimate the link between peer suspensions and non-suspended students' learning trajectories in a California school district…

This study investigated the relative importance of three subdomains of early number competence (number, number relations, and number operations) in predicting later mathematics achievement in cross-sequential samples of pre-K, kindergarten (K), and first graders (N=150 at each grade). OLS-regression analyses showed that each subdomain predicted…

Evolution is controversial among students and religiosity, religious affiliation, understanding of evolution, and demographics are predictors of evolution acceptance. However, quantitative research has not explored the unique impact of student perceived conflict between their religion and evolution as a major factor influencing evolution…

Teacher candidates in California are required to pass four standardized tests: the California Basic Educational Skills Test, the California Subject Examinations for Teachers, the Teacher Performance Assessment, and the Reading Instruction Competence Assessment. Many underrepresented minority teacher candidates fail to pass these required tests in…

In the spring of 2018 the Northern California/Nevada Section of the American Association of Physics Teachers was alerted to a local high school's plans to eliminate physics for the following school year. As part of the campaign to support the school's efforts to sustain physics in the following year, the physics offerings from the surrounding…

Hispanic first-generation college students (FGCS) experience more potential barriers to college success than continuing generation college students (CGCS). With an eye toward identifying ways to support students in negotiating these barriers, there were three purposes to this study. First was to understand the variability among Hispanic FGCS based…

Native Americans are highly underrepresented in science, technology, engineering, and math (STEM) careers; however, little research exists concerning how to promote Native Americans' participation in STEM. In this study, we address this gap by examining variables hypothesized to promote participation using the career self-management (CSM) model…

Viewed through a social justice lens, preschool expulsion is an educational equity issue. This study focused on prior expulsion from preschool and child-care in a longitudinal study of 203 autistic children, ages 4 to 7. By parent report, 16%--one out of six autistic children--had been expelled from a preschool or child-care setting prior to…