Jessica S Brown Waesche|Christopher Schatschneider|Jon K. Maner|Yusra Ahmed|Richard K. Wagner
Examining Agreement and Longitudinal Stability Among Traditional and RTI-Based Definitions of Reading Disability Using the Affected-Status Agreement Statistic
Florida State University|Florida State University|Florida State University|Florida State University|Florida State University
rates agreement among alternative definitions reading disability 1 2year stabilities examined using new measure agreement affectedstatus agreement statistic participants 288114 first third grade students reading measures dynamic indicators basic early literacy skills oral reading fluency nonsense word fluency six levels severity poor reading examined 25th 20th 15th 10th 5th 3rd percentile ranks four definitions compared including traditional unexpected low achievement three responsetointerventionbased definitions low achievement low growth dual discrepancy rates agreement variable poor moderate overall poorest agreement unexpected low achievement definitions longitudinal stability poor poorest stability low growth definition implications research practice discussed