PSYCH 100A Lecture Notes - Lecture 10: Standard Deviation, Sampling Error, Dependent And Independent Variables
Document Summary
A single sample of individuals is measured more than once on the same dependent variable. Often used to track changes in a dependent variable over time: repeated procedures with the same individual. These designs are used to study phenomena that are expressed as differences among behavioral measures at different times, such as learning, forgetting, attitude change, etc. Each individual in one sample is matched with an individual in another sample: matching is done so that the two individuals are equivalent with respect to a specific variable that the researcher would like to control. Match with respect to age, gender, iq, ethnicity. Participants in each group are the same, related, or matched: related subjects. More efficient: use far fewer cases than a corresponding randomized-groups design, more data can be collected in a short period of time. Removes subject differences from the error term. This in turn increases the power of the study.
