| PROBLEM IN CORRELATIONAL RESEARCH |
PARALLEL IN EXPERIMENTAL RESEARCH |
|---|---|
| NOT ENOUGH PARTICIPANTS | NOT ENOUGH PARTICIPANTS |
| INSENSITIVE MEASURES | INSENSITIVE MEASURES |
| NON-LINEAR RELATIONSHIPS | NON-LINEAR RELATIONSHIPS - ESPECIALLY A PROBLEM WHEN INVESTIGATOR DOING SIMPLE EXPERIMENT CHOOSES A LOW LEVEL OF THE INDEPENDENT VARIABLE AND A HIGH LEVEL OFTHE INDEPENDENT VARIABLE, AND THE RELATIONSHIP IS NOT LINEAR. |
| RESTRICTION OF RANGE IN THE 1. PREDICTOR VARIABLE (NOT CHOOSING PARTICIPANTS WHO WERE DIFFERENT ENOUGH ON THE VARIABLE) OR 2. CRITERION VARIABLE, DUE TO CEILING EFFECTS, FLOOR EFFECTS, INSENSITIVE MEASURES, OR NOT CHOOSING PARTICIPANTS WHO WERE DIFFERENT ENOUGH ON THAT VARIABLE. |
NOT HAVING ENOUGH VARIABILITY IN THE 1. INDEPENDENT VARIABLE (NOT ASSIGNING PARTICIPANTS TO LEVELS THAT WERE DIFFERENT ENOUGH ) OR 2. DEPENDENT VARIABLE, OFTEN DUE TO CEILING EFFECTS, FLOOR EFFECTS, OR AN INSENSITIVE MEASURE. |