Tag: treatment effects

December 4, 2025 / Mohammed looti

NONRANDOMIZED DESIGN

Introduction to Nonrandomized Design Nonrandomized design is a fundamental research methodology employed across psychology, medicine, and social sciences, characterized fundamentally by the absence of random assignment of participants to intervention or control groups. Unlike the rigorous standards of a Randomized Controlled Trial (RCT), where chance mechanisms ensure that groups are statistically equivalent at baseline, nonrandomized […]

November 3, 2025 / Mohammed looti

REVERSAL DESIGN

Introduction to Reversal Designs The Reversal Design, often categorized under the umbrella of single-subject experimental designs (SSEDs), represents a powerful methodological strategy utilized primarily within behavioral psychology and applied behavior analysis (ABA). This design is fundamentally an exploratory arrangement engineered specifically to control for potential confounding variables inherent in time-series data collection. Its primary function […]