Repeated measures

Question 1

Repeated measures design

Answer 1

When all subjects are tested on all conditions

Question 2

Complete design

Answer 2

When subjects are tested on the conditions more than once

Question 3

Incomplete design

Answer 3

When subjects are tested on the conditions once

Question 4

Reasons to use repeated measures

Answer 4

-Good when you have few participants
-Effectivity
-Increased sensitivity for the experiment
-Study difference in in participants over time

Question 5

Sensitivity

Answer 5

An experiment has high sensitivity if you can discover the effect of the independent variable even if the effect is small.

Question 6

Practice effect

Answer 6

Changes over time in an experiment because of, for example, the subject getting better at the test over time, they get more relaxed over time, more tired, less motivated…

Question 7

What balancing methods are used for incomplete designs?

Answer 7

All possible orders (4 or fewer conditions)
Selected orders (5 or more)

Question 8

What balancing methods are used for complete designs?

Answer 8

Block randomization (if it’s likely there will be anticipation problems)
ABBA counterbalancing (if it isn’t likely)

Question 9

ABBA counterbalancing

Answer 9

Used when conditions are presented few times per participant. You use a random sequence for example DACB, then BCAD, repeat with new sequence.

Question 9

All possible orders

Answer 9

Used in incomplete design when the amount of conditions is four or less.

Question 10

Latin square

Answer 10

Randomize first sequence, then move every condition +1

Question 11

Random start order with rotation

Answer 11

Used in incomplete design, randomize first sequence and then rotate.

Question 12

Differential transfer

Answer 12

When the effect of a condition persists and affects the following conditions - for any condition

Question 13

Solution for differential transfer

Answer 13

-Use independent group design by only looking at the first condition for each subject.

Question 14

How can you tell if there is differential transfer?

Answer 14

By taking the mean of the entire result and comparing it to an independent group design (the first of the conditions)

Question 15

Non-linear practice effect

Answer 15

When the practice effect abruptly changes, for example when it takes longer to answer the first question and the rest are faster. This is true no matter what condition the practice effect is on

Question 16

Solutions to non-linear practice effect

Answer 16

Practice phase, cast aside the first values, use a relevant balancing technique