PSYC 217 Chapter Notes - Chapter 11: Needs Assessment, Program Evaluation, Repeated Measures Design
Document Summary
Purpose: evaluates effect on iv on few participants. Pro/con: pro: good for generating hypothesis, con: lack generalization; many alternative factors. Iv is introduced at different times: across behaviors, several behaviors of single participant are measured. Iv is introduced at different times: across situations, behavior is measured in different settings. Quasi-experimental designs: low internal validity, lack control conditions, causal reference is harder, no random assignment: pre-existing groups or put themselves into groups, selection differences: pre-existing differences between groups that are confounded with iv. Similarities with correlational studies: no random assignment, measures outcome variables. Differences with correlational studies: qe puts participants into different conditions, qe can deal with multiple discrete groups w/o inherent order (e. g. nationalities, c only deals with 2 discrete groups w/o inherent order (e. g. genders) Maturation: people change over time independent of manipulation, e. g. fatigued, hunger, more mature. Instrumental decay: use of measure changes over time, e. g. using a rubric over long periods of time.
