Experimental designs Between Withinsubjects l Betweensubjects design l
Experimental designs
Between- / Within-subjects l Between-subjects design l l l Each partcipant takes part in 1 experimental condition Analysis of differences between groups of participants from different conditions Within-subjects design l l Subjects take part in all conditions Analysis of differences of results from same participants over different conditions
Experimental research as conclusive research Conclusive Research Descriptive Causal Experimentation Field Experiments Laboratory Experiments
Preexperimental designs l One-Group After-Only l One-Group Before-After l Nonequivalent posttest-only
Validity in experimentation l Internal validity l l l Is effect CAUSED by manipulation of independent variable? Rival hypothesis / extraneous variables External validity l Generalization beyond experimental situation
Randomized Two-Group Design
Before-After Two Group Design
Solomon Four-Group Design
2 2 Factorial Design
Repeated Measures
Static-Group Comparison Design
Pretest-Posttest Nonequivalent Control Group Design
Regression-Discontinuity Design
One-Group Pretest-Posttest Design
Interrupted Time-Series Design
Replicated Interrupted Time-Series Design
Laboratory versus Field experiments Environ ment LAB Artif ici al FIEL D Real ist ic Control High Low Reactive error High Low Demand artifac ts High Low
- Slides: 17