Complex Experimental DesignsComplex Experimental Designs

INCREASING THE NUMBER OF INCREASING THE NUMBER OF LEVELS OF AN INDEPENDENT LEVELS OF AN INDEPENDENT

VARIABLEVARIABLEProvides more information about the

relationship than a two level designCurvilinear Relationship

Inverted-U

Comparing Two or More GroupsI.E. How dogs, cats, and birds as opposed to

dogs alone have beneficial effects on nursing home residents

LINEAR VERSUS POSITIVE LINEAR VERSUS POSITIVE MONOTONIC FUNCTIONSMONOTONIC FUNCTIONS

LINEAR VERSUS POSITIVE LINEAR VERSUS POSITIVE MONOTONIC FUNCTIONSMONOTONIC FUNCTIONS

INCREASING THE NUMBER OF INCREASING THE NUMBER OF INDEPENDENT VARIABLES: INDEPENDENT VARIABLES:

FACTORIAL DESIGNSFACTORIAL DESIGNSFactorial Designs: Designs with more than

one independent variable (or factor)Simplest Factorial Design

2 x 2 factorial designHas two independent variables

INCREASING THE NUMBER OF INCREASING THE NUMBER OF INDEPENDENT VARIABLES: INDEPENDENT VARIABLES:

FACTORIAL DESIGNSFACTORIAL DESIGNSInterpretation of Factorial Designs

Main effects of an independent variableInteraction between the independent variables

Factorial Designs with Manipulated and Nonmanipulated VariablesIV x PV designs

(Independent Variable by Participant Variable)

INCREASING THE NUMBER OF INCREASING THE NUMBER OF INDEPENDENT VARIABLES: INDEPENDENT VARIABLES:

FACTORIAL DESIGNSFACTORIAL DESIGNS Interactions and Moderator Variables Outcomes of a 2 x 2 Factorial Design

1. There may or may not be a significant main effect for independent variable A

2. There may or may not be a significant main effect for independent variable B

3. There may or may not be a significant interaction between the independent variables(See results in next five slides)

Interactions and Simple Main Effects Simple main effect of anxiety Simple main effect of studying

INCREASING THE NUMBER OF INCREASING THE NUMBER OF VARIABLES: FACTORIAL VARIABLES: FACTORIAL

DESIGNSDESIGNS

A

INCREASING THE NUMBER OF INCREASING THE NUMBER OF VARIABLES: FACTORIAL VARIABLES: FACTORIAL

DESIGNSDESIGNS

INCREASING THE NUMBER OF INCREASING THE NUMBER OF VARIABLES: FACTORIAL VARIABLES: FACTORIAL

DESIGNSDESIGNS

INCREASING THE NUMBER OF INCREASING THE NUMBER OF VARIABLES: FACTORIAL VARIABLES: FACTORIAL

DESIGNSDESIGNS

INCREASING THE NUMBER OF INCREASING THE NUMBER OF VARIABLES: FACTORIAL VARIABLES: FACTORIAL

DESIGNSDESIGNS

INCREASING THE NUMBER OF INCREASING THE NUMBER OF VARIABLES: FACTORIAL VARIABLES: FACTORIAL

DESIGNSDESIGNS

INCREASING THE NUMBER OF INCREASING THE NUMBER OF INDEPENDENT VARIABLES: INDEPENDENT VARIABLES:

FACTORIAL DESIGNSFACTORIAL DESIGNSAssignment Procedures and Factorial

DesignsIndependent groups designRepeated measures designMixed factorial design using combined

assignment

INCREASING THE NUMBER OF INCREASING THE NUMBER OF INDEPENDENT VARIABLES: INDEPENDENT VARIABLES:

FACTORIAL DESIGNSFACTORIAL DESIGNS

INCREASING THE NUMBER OF INCREASING THE NUMBER OF INDEPENDENT VARIABLES: INDEPENDENT VARIABLES:

FACTORIAL DESIGNSFACTORIAL DESIGNS

INCREASING THE NUMBER OF INCREASING THE NUMBER OF INDEPENDENT VARIABLES: INDEPENDENT VARIABLES:

FACTORIAL DESIGNSFACTORIAL DESIGNS

INCREASING THE NUMBER OF INCREASING THE NUMBER OF INDEPENDENT VARIABLES: INDEPENDENT VARIABLES:

FACTORIAL DESIGNSFACTORIAL DESIGNSIncreasing the Number of Levels of an

Independent Variable2 x 3

Increasing the Number of Independent Variables in a Factorial Design2x2x3 = 12 conditions!Gets unwieldy pretty quickly

INCREASING THE NUMBER INCREASING THE NUMBER OF VARIABLES: FACTORIAL OF VARIABLES: FACTORIAL

DESIGNSDESIGNS