Week 9 - ANOVA Flashcards
T-test
2 groups, 1 measure
Type 1 error
False alarm
Type 2 error
Miss. Say null when actually it is H1
F-statistic
Step 1 of ANOVA
ANOVA
Analysis of variance >2 groups
1-way ANOVA and 2-way ANOVA
Between groups + within groups designs. 1 DV, 2 IVs
Post-hoc tests
ANOVA finds significant differences, post-hoc tells us where!
Bonferroni
Significance level divided by number of t-tests eg. 0.05 / 2 = 0.025
Factorial ANOVA
1DV, multiple IVs
Interaction effect
Effect of 1 IV depends on level of 2nd IV eg. vitamins and exercise on health!
ANCOVA
2+ groups and covariate (control for 3rd variable)
MANOVA
2+ groups and multivariate (>1 DV)
MANCOVA
2+ groups, multivariate (>1 DV) and covariate (control 3rd variables)
Assumptions for t-test, ANCOVA etc.
Independent samples, normal distribution, homogeneity of regression slopes, linear and homogeneity of variance.
Homogeneity of regression slopes
No interactions
Homogeneity of variance
Variance is equal, Levene’s test
To find normal distribution
Kolmogorov-Smirnov or Shapiro-Wilk