STATS 5 Flashcards
(17 cards)
What is unrelated one-way ANOVA used for?
Between-participants designs where we have 1 DV and 1 IV with 3+ conditions
What does unrelated one-way ANOVA do?
Compares variation of scores from 3 or more groups
How do we calculate true scores in unrelated one-way ANOVA?
Column/group means become true scores
How do we calculate error scores in unrelated one-way ANOVA?
Subtract true scores from raw scores
How do we calculate degree of freedom for true scores in unrelated one-way ANOVA?
No. of conditions - 1
How do we calculate degree of freedom for error scores in unrelated one-way ANOVA?
N - no. of conditions
What is the F ratio formula for unrelated one-way ANOVA?
F = Variance estimate (of true scores) / Variance estimate (of error scores)
If the alternative hypothesis is correct, should variance be greater in the true scores or the error scores?
Variance in true scores should be greater than variance in error scores
What is related one-way ANOVA used for?
Within-participants designs where we have 1 DV and 1 IV with 3 or more conditions
How do we reduce error in related ANOVA?
Remove individual differences
How do we remove individual differences in related ANOVA?
Subtract row (participant) means from error scores
In unrelated ANOVA we divide by variance estimate of error scores to get F ratio. What do we divide by instead in related ANOVA?
Variance estimate of residual error scores
How is the degree of freedom calculated for residual error variance?
(conditions - 1) x (rows - 1)
What is two-way ANOVA used for?
Between OR within subjects designs where we have 1 DV and at least 2 IV’s
What does two-way ANOVA do?
Compares variation across 2+ IV’s and the variation of their interaction
What are the four sources of variance in two-way ANOVA?
Error Component
True Component 1 (main effect of IV1)
True Component 2 (main effect of IV2)
Interaction Component
How many F-Ratios must we conduct in two-way ANOVA?
3
