Flashcards
Effect sizes
Cards in this deck (7)
- 1How do we indicate an effect size for associations?Correlations - Pearson's r
Correlations are on a standardised scale (-1 to 1) therefore they can indicate the strength of an assocation - 2What is the coefficient of determination?r2 (correlation squared)
The amount of variance we can predict in a variable using another variable - 3How do we indicate an effect size for mean differences?Cohen's d
- 4How is the mean difference expressed?In standard deviations
- 5How is Cohen's d calculated?1. Calculate the mean difference
2. Calculate pooled SD
3. Divide mean difference by pooled SD - 6How do you calculate the pooled SD?1. Square SD1, square SD2, add together
2. Divide answer by 2
3. Take the square root - 7How to interpret Cohen's dThe larger the number, the greater the effect size
Roughly:
Small = .20
Medium = .50
Large = .80
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- Psychology (PS1813 - Research methods) Flashcards on Effect sizes, created by Sian Allen on 27/05/2022.
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- Sian Allen
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