PSYC-2102 Chapter Notes - Chapter 9: Repeated Measures Design, Dependent And Independent Variables, Random Assignment
22 Feb 2015
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Factorial designs: a design in which there is one and only one independent variable, the simplest possible kind of one way design is the two-groups design. In these designs, there are two levels to the independent variable (usually an experimental and a control group): experimenters often make use of one other kind of one-way design, the one-way multiple groups design. This design has one independent variable with three or more levels. They are the factorial equivalent of the only kind of effect that you can detect in one-way designs. They clarify the precise nature of an interaction. They also have one-way and factorial designs: advantages of within subjects designs, they require less participants than between subjects designs (especially when it comes to factorial designs). Within subject designs also do not need to fight against noise caused by individual differences; thus even fewer participants are required for a clear picture.
