PSYB45H3 Lecture Notes - Lecture 9: Data Analysis, Behavior Modification, Internal Validity
Document Summary
The measure of behavior is dependent variable and the treatment or the intervention is independent variable. Internal validity if it convincingly demonstrated that the independent variable caused the observed change in the dependent variable to other behaviors, individuals, settings or treatments. Reversal-replication design: an experimental design consisting of a baseline phase followed by a treatment phase, followed by a reversal back to baseline conditions, and follow by a replication of the treatment phase. The baseline is represented as a and the treatment noted as b. Hence it is also called an abab design. It has also been called a withdrawal design because the treatment is withdrawn during the second baseline phase. Ideally, a baseline phase should continue until the pattern of performance is stable or until it shows a trend in the direction opposite to that predicted when the independent variable is introduced. Scientific considerations related to the newness of the independent and dependent variables should be reviewed.
