SPCE 630 Midterm

SPCE 630 Midterm Threats to internal validity include: - History, maturation, testing, procedural infidelity, testing, instrumentation, selection bias, multiple treatment interference, data instability, cycliccal variability, regression to the mean, adaptation, Hawthorne effect History: - Events that occur during the experiment but that are not related to the planned procedural changes that may influence the outcomes Maturation - Changes in behavior due to the passage of time. Testing - Occurs when participants need to respond to the same test repeatedly during a baseline or probe condition, which influences responding. Instrumentation - Threats related to the measurement system, and are of concern because of repeated measurement by human observers who may make errors. Procedural Infidelity - Inconsistent implementation of the experimental condition. Attrition - The loss of participants during a study, which limits the generality of findings. Multiple Treatment Interference - Occurs when a participant's behavior is influenced by more than one planned intervention during the course of a study