When analyzing treatment effects on test scores, researchers face many choices and competing guidance for scoring tests and modeling results. This study examines the impact of scoring choices through simulation and an empirical application. Results show that estimates from multiple methods applied to the same data will vary because two-step models…

This study compares latent profiles derived from student subgroups of varying levels of mathematical skills defined by achievement and ability assessment scores. Achievement and ability cut scores for identifying students at both ends of the mathematics spectrum were applied and the resulting latent profiles within each condition were compared.…

Early literacy proficiency is a crucial predictor of later reading success, but research in this area often overlooks the unique challenges faced by English Learners (EL). This study addressed a significant gap in the literature by investigating the relationships between Dynamic Indicators of Basic Early Literacy Skills (DIBELS) scores, English…

The Matthew Effect is an educational theory that children who begin their academic careers with lower reading scores do not catch up to their peers, instead falling farther and farther behind as their schooling progresses. This study includes a hierarchical multiple-regression analysis of within-year benchmark data for the presence of Matthew…

In mathematics, there are four basic operations that students must master from the elementary school level, namely addition, subtraction, multiplication, and division. However, some students experience difficulties or misunderstandings in interpreting multiplication as repeated addition. This research aims to improve the learning outcomes of…

Montessori is a highly individualized pedagogy that prioritizes following each child's individual interests over standardized test scores. This quasi-experimental study compares groups of Montessori students (treatment groups, N = 535-710) with control groups of non-Montessori students, matched through the simple matching method, which controls…

LXD Research conducted a study to evaluate the impact of the Zaner-Bloser Kickstart: Number Sense program, a math intervention designed to enhance foundational math skills among first and second-grade students in an Oregon school district over a three-year period from spring 2019 to Spring 2023. The program was implemented in two schools, engaging…

There is no final consensus regarding which covariates should be used (in addition to prior achievement) when estimating value-added (VA) scores to evaluate a school's effectiveness. Therefore, we examined the sensitivity of evaluations of schools' effectiveness in math and language achievement to covariate selection in the applied VA model. Four…

There is considerable variability in the literacy assessments taken in Kindergarten through second grade, across schools and between multilingual learners and other students, and within students over time. This makes it difficult to study changes in students' acquisition of ELA skills in these formative years, or to evaluate policies and practices…

This quantitative, causal-comparative research study investigated whether school configuration has an impact on the reading performance of sixth-grade students by comparing the End-of-Grade (EOG) reading assessment Grade Level Proficiency (GLP) scores of sixth-grade students in K-8 configured schools to sixth-grade students enrolled in 6-8 grade…

This study compared students' performance on Istation, a computer-based progress-monitoring tool, and easyCBM, a paper-pencil progress-monitoring tool. Participants included 106 students in Grades K-6 from a rural school in New Mexico. Teachers in these grade levels administered both assessments three times during the school year. Results…

This study considers a contextualized approach to grammar instruction, asking: "Does embedded instruction using published authors as mentors improve grammar and usage for young writers?" Twenty-three students in one second-grade classroom participated. Students were taught grammar conventions through use of mentor texts for 45 minutes a…

The purpose of this study was to investigate developmental music aptitude with a broader sample in order to propose national norms. Research questions were: 1) To what extent are published Primary Measures of Music Aptitude (PMMA) norms different from those established using a current sample? 2) Are there comparative differences in PMMA item…

This study examined the effect of small class size intervention on student outcomes using reading achievement scores as measured by the Comprehensive Test of Basic Skills (CTBS), a standardized, norm-referenced test, while controlling for independent variables inclusive of students' gender, race, socioeconomic status (SES), and environment. This…

Teaching linguistic aspects relevant to text construction is an essential component of any thorough writing instruction program, despite the conflicting evidence regarding its effectiveness. In this study, 889 second- and fourth-grade students were assigned to one of three conditions: Self-Regulated Development (SRSD), SRSD-connectors (SRSD-C),…