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Experimental Designs

Experimental Designs. Part 2: Mixed Design and Repeated Measures. Experimental Design Names. The name of an experimental design depends on three pieces of information The number of independent variables The number of levels of each independent variable The kind of independent variable

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Experimental Designs

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  1. Experimental Designs Part 2: Mixed Design and Repeated Measures

  2. Experimental Design Names • The name of an experimental design depends on three pieces of information • The number of independent variables • The number of levels of each independent variable • The kind of independent variable • Between Groups • Within Subjects (or Repeated Measures)

  3. Experimental Design names • If there is only one independent variable then • The design is a one-way design (e.g. does coffee drinking influence exam scores) • If there are two independent variables • The design is a two-way design (e.g. does time of day or coffee drinking influence exam scores). • If there are three independent variables • The design is a three-way design (e.g. does time of day, coffee drinking or age influence exam scores).

  4. Experimental Design Names (Cont.) • If all the IVs are between groups then • It is a Between Groups design • If all the IVs are repeated measures • It is a Repeated Measures design • If at least one IV is between groups and at least one IV is repeated measures • It is a Mixed or Split-Plot design

  5. Example • Three IVs • IV 1 is between groups and has two levels (e.g. a.m., p.m.) • IV 2 is between groups and has two levels (e.g. coffee, water). • IV 3 is repeated measures and has 3 levels (e.g. 1st year, 2nd year and 3rd year). • The design is: • A three-way (2x2x3) mixed design.

  6. Within Subjects • Repeated measures • Within–subjects factorial design • Participants serve in all conditions • 2 X 2 • 2 X 2 X 2 Aggressive/Pro–social stimuli X Similar/Dissimilar Target X Positive/Negative Target • Limit on number of conditions • Counterbalancing

  7. Mixed designs • Between and within factors • Subject variables

  8. Mixed Design Before/After X Treatment/Control

  9. Mixed Design Before/After X Treatment/Control

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