Experimental designs
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Experimental designs PowerPoint PPT Presentation


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Experimental designs. Between- / Within-subjects . Between-subjects design Each partcipant takes part in 1 experimental condition Analysis of differences between groups of participants from different conditions Within-subjects design Subjects take part in all conditions

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Experimental designs

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Experimental designs


Between- / Within-subjects

  • Between-subjects design

    • Each partcipant takes part in 1 experimental condition

    • Analysis of differences between groups of participants from different conditions

  • Within-subjects design

    • Subjects take part in all conditions

    • Analysis of differences of results from same participants over different conditions


Conclusive

Research

Descriptive

Causal

Experimentation

Field

Experiments

Laboratory

Experiments

Experimental research as conclusive research


Preexperimental designs

  • One-Group After-Only

  • One-Group Before-After

  • Nonequivalent posttest-only


Validity in experimentation

  • Internal validity

    • Is effect CAUSED by manipulation of independent variable?

    • Rival hypothesis / extraneous variables

  • External validity

    • 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


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