PSYC26 Chapter 3: Chapter 3
Document Summary
Between-subject design different participants are assigned to different levels of iv. Within-subject design all participants are assigned to all levels of iv. Cross-sectional design testing different groups of people at different ages. Longitudinal design repeatedly testing the same sample of people across the ages of interest. Longitudinal designs same group studied at least twice cross time period. When does repeated testing become longitudinal: when it is spread out over some period of time at which you would expect to see an important developmental change. Could be a year, could be a week. Depends on the experiment and what kind of change you want to see. Reaching in infants brought them in every week from 12-16 weeks old. During these weeks, they are significantly changing. Repeated tests that span an appreciable period of time this varies with the developmental level of the sample. Cohort a single generation born at about the same time. Advantages: practical issues way easier.
