ceiling and floor effects | Measurement problems whereby the researcher cannot measure the effects of an independent variable or a possible interaction because performance has reached a maximum or minimum in any condition of the experiment.
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complex design | Experiment in which two or more independent variables are studied simultaneously.
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interaction effect | Occurs when the effect of one independent variable differs depending on the level of a second independent variable.
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main effect | Overall effect of an independent variable in a complex design.
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relevant independent variable | Independent variable that has been shown to influence behavior, either directly, by producing a main effect, or indirectly, by resulting in an interaction in combination with a second independent variable.
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simple main effect | Effect of one independent variable at one level of a second independent variable in a complex design.
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