The MacArthur-Bates Communicative Development Inventories (CDI) are widely used, parent-report instruments of language acquisition. Here, we focus on the word-inventory sections of the instruments, and show two different approaches to modeling CDI data, based on real-world needs. First, we show that Words & Gestures data collected…

The purpose of this registered report study was to determine the effects of explicit text structure instruction on the expository text comprehension of students with language and learning disabilities (LLD) using a multiple baseline design across conditions (e.g., compare-contrast and cause-effect) and participants. Participants included four…

The extent to which reading achievement is causally impacted by eligibility for special education services due to a learning disability (LD) or speech or language impairment (SLI) is currently unclear. In this registered report, we analyzed U.S. national data from the Early Childhood Longitudinal Study--Kindergarten Cohort of 2010-2011 (ECLS-K:…

This study used data from the U.S. state of Michigan schools participating in the "Reading First" program to examine the stability of students' disability status in Grades 1 to 3. Reading First aimed to improve at-risk students' reading comprehension through research-based instruction. We analyzed how changes in students' disability…