| 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.
|
 |
|
|
| complex design | Experiment in which two or more independent variables are studied simultaneously.
|
|
|
|
| interaction effect | Occurs when the effect of one independent variable differs depending on the level of a second independent variable.
|
|
|
|
| main effect | Overall effect of an independent variable in a complex design.
|
|
|
|
| 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.
|
|
|
|
| simple main effect | Effect of one independent variable at one level of a second independent variable in a complex design.
|