Introduction and Definition of the Yoked-Control Group Design The yoked-control group design represents a sophisticated methodology within the realm of quasi-experimental research, specifically engineered to maximize internal validity when true random assignment is either impractical, unethical, or methodologically impossible. This design mandates the comparison of at least two groups—an experimental group receiving the primary intervention […]
Before-After Design Definition Before-after design is a type of evaluation technique in which the effect of an intervention is assessed by comparing outcomes from a population before and after the intervention. This technique is used to measure the effectiveness of public health interventions, such as the introduction of new public health policies, prevention strategies, or […]
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 […]
Introduction to the Multiple Baseline Design The Multiple Baseline Design (MBD) stands as one of the most robust and widely utilized methodologies within single-subject research, particularly in the fields of experimental psychology and Applied Behavior Analysis (ABA). It is fundamentally an experimental design where several behavioral items, subjects, or contexts are assessed repeatedly, often simultaneously, […]
Small-N Experimental Design The Core Definition of Small-N Experimental Design The small-N experimental design, often interchangeably referred to as single-subject design or single-case experimental design, represents a powerful and rigorous methodological approach primarily utilized in fields such as applied behavior analysis, clinical psychology, and education. At its core, this design involves the intensive study of […]
Time-Series Design Introduction to Time-Series Design Research methodologies in psychology and related fields are constantly evolving to provide more robust and reliable insights into human behavior and the effectiveness of interventions. Among these, time-series design stands out as a particularly powerful and versatile approach. It is a research strategy that involves repeated measurements of a […]