PSY1022 Lecture Notes - Random Assignment, Confounding, Latin Square
Document Summary
Dv is measured after the manipulation of the iv. Extent to which results can be attributed to the manipulation of the iv. Problem in subject selection/assignment may lead to important differences between subjects. Outside event that is not part of the manipulation. Extreme scores, upon retesting, tend to be less extreme, moving towards the mean. Differential dropout rates, leading to inequality between groups. Observed changes due to info being received from other subjects. Limitation of the measuring instrument that decreases its capability to differentiate between scores at the bottom of the scale. Limitation that decreases its capability to differentiate between scores at the top of the scale. Replicating a study using the same method of manipulation. Study that varies from an original study in one way. Including all orders of treatment presentation, or by randomly determining the order for each subject. Counterbalancing technique to control for order effects without using all possible orders.
