ANOVA Flashcards
ANOVA is …
Test of means for two or more populations; metric dependent, 1+ non-metric independent; also analyzes the variance
H0 is …
That the means are equal
Assumptions are …
Metric dependent variable, normally distributed, independent; fixed independent variable; equal and constant variance (Levene’s), the error term is normally distributed, the error is independent
Test normality by using …
Histogram, P-P plots, but, if sample size > 200, no need
Which test for testing assumption of the equal variance across groups
Levene’s test
How to test significance
F-test to see if the mean of the dependent variable differs across groups ( if >5.14, then significant)
Eta^2 is …
Strength of the effect of X on Y
For N-Way ANOVA, what are the patterns of interactions
No interaction, ordinal, or disordinal
ANCOVA
Also looking at the independent variables which are not controlled (prior knowledge), and independent variable can be metric
The grand mean is …
The average of the dependent variable
F-test is used to …
Test the mean differences across groups
