# Measuring effects within subjects

• Reduced individual differences
• Fewer participants required
HideShow resource information
• Created by: Shannon
• Created on: 14-12-14 18:28
What are the 4 main advantages of a within subjects design?
1. Reduced individual differences 2. Fewer participants required 3. Good for longitudinal measurement 4. Good way to show the power of an effect
1 of 12
What is the main violation of assumptions?
Data are not independent as the same participants have generated scores in multiple conditions.
2 of 12
Name the main disadvantages of within subjects design.
Carryover effects (practice, fatigue, attrition and experience of test conditions) and transfer effects - conditions may influence performance in other conditions.
3 of 12
Name 5 ways to reduce the impact of carryover effects.
1. Counterbalancing 2. Randomization of condition orders 3. re-training 4. Wahout period 5. Treat treatment order as an IV.
4 of 12
Why do we need to calculate covariance in a paired samples t-test?
Because scores from the same participants are correlated.
5 of 12
What are the assumptions of a paired samples t-test?
1. Heterogenity of variance 2. non-normal distribution of scores 3. Normally distributed difference scores 4. Categorical IV 5. Continuous DV.
6 of 12
What is error considered to be in a 1-way ANOVA?
Unsytematic (due to chance) as it cannot be measured
7 of 12
What is the top number known as in a fraction?
Numerator
8 of 12
What is the bottom number in a fraction known as?
Denominator
9 of 12
What error is present in RM ANOVA?
Unsystematic (due to chance. Denominator of f-ratio) and systematic (individual differences)
10 of 12
What does N stand for in an RM ANOVA?
Number of observations.
11 of 12
What arethe assumptions of an RM ANOVA?
Refer to paired samples t-test assumptions...+ Sphericity (Variances within conditions are similar)
12 of 12

## Other cards in this set

### Card 2

#### Front

What is the main violation of assumptions?

#### Back

Data are not independent as the same participants have generated scores in multiple conditions.

### Card 3

#### Front

Name the main disadvantages of within subjects design.

### Card 4

#### Front

Name 5 ways to reduce the impact of carryover effects.

### Card 5

#### Front

Why do we need to calculate covariance in a paired samples t-test?

## Similar Psychology resources:

See all Psychology resources »See all Research Methods resources »