RM- experimental designs

independent groups/repeated measures/matched pairs. order effects/counterbalancing

Independent groups

Participants in the sample are split into two separate groups

each group does one condition of the IV

Repeated measures

All participants in the sample do all conditions

Mached pairs

Participants are paired on key characteristics

one person from each pair is placed n each condition

Order effects

How the positioning of tasks in a repeated measures design influences the outcome

Practise effect

Pariticipants get better in second condition

Boredom effect

Participants get worse in second condition

Counterbalancing

a way to overcome order effects in a repeated measures desing

+No order effects

Independent groups/matched pairs (S)

+No demand characteristics

Independent groups/matched pairs (S)

-Participant variables

Independent groups (W)

+No participant variables

Repeated measures/matched pairs (S)

-Order effects

Repeated measures (W)

-Demand characteristics

Repeated measures (W)

-Time consuming

Matched pairs (W)

-Participants may not agree to take part

Matched pairs (W)

-Cant control every participant variable

Matched pairs (W)