PSYC3042 Lecture Notes - Lecture 5: Factorial Experiment, Level Of Measurement, Vise
Document Summary
Reading notes on interactions, - patterns of results for main effects and interactions that can be produced when analysing the results of a study with a 2 x 2 factorial design (based on evans, chapter 14). A x b interaction (ordinal; over- additive effects) Because you"ve hit the ceiling or floor measurement on a potential interval scale, you don"t know the true extent of the measurement. ceiling compression produces the interaction. Overall, a disordinal interaction is the conclusion that the interaction is safe. Disordinal interaction is a very strong result because it is basically impossible that there are two hidden main effects. The scores cannot be distorted by the scale in a disordinal interaction . Because with disordinal interactions, you are not comparing differences between scores on one part of your scale with differences between scores on an entirely different part of the scale and instead, you are making comparisons between scores that overlap.
