Within-Subjects Design

1. Within-Subjects Design (Repeated Measures)

2. Matched Pairs Design Used when participants are _______ Participants are matched on variable _______ to DV; one from each pair is randomly assigned to _____ condition

3. Matched Pairs Design How is Power impacted? __________ Differences between groups are ________ ________ validity is increased

4. Matched Pairs Design __________ Degrees of freedom are ________ Df for simple experiment (N-2) Df for matched pairs design (Number of pairs � 1) EXAMPLE: 20 participants Simple experiment Df = 20-2 (18) Matched pairs design Df = 10 pairs � 1 (9)

5. Within-groups Design(Repeated Measures)

6. Advantages _________ Power ________ Participants Needed

7. Disadvantages _______ Effects The order in which participant receives treatment ______ response

8. Order Effects 1) __________ Carryover Delayed or _______ effects of prior treatment 2) __________ Performing one task ________ performance on second task

9. Order Effects 3) _______ Being tired or ______ from already doing task 4) ________ Perform _______ 2nd time because participant learned from the first time

10. Order Effects 5) __________ Figure out ________ after receiving the first treatment Become �_________� to the IV

11. Solution to Order Effects _______________ All participants receive treatment but receive _________ sequences __________ determine which treatment comes first, second, etc. Doesn�t __________ equal representation of orders

12. Solution to Order Effects ________________ __________ Present _______ possible order of all conditions Works well with a few conditions __________ Used when _________ conditions involved Generate single order, then _______ it ABCDE and EDCBA

13. Latin Square ___________ Procedure guaranteeing each condition precedes every other condition just as many times as it ________ that condition

14. Latin Square 1 2 ` 3 4 Grp1 A B D C Grp2 B C A D Grp3 C D B A Grp4 D A C B