ANCOVA

?
What is the purpose of including covariates in ANOVA?
To reduce within-group error variance
1 of 8
What is another purpose of including covariates in ANOVA?
Elimination of confounds, once a possible confounding variable has bee identified it can be measured and entered into the analysis as a covariate
2 of 8
What are the two additional considerations of an ANCOVA?
Independence of the covariate and treatment effect and homogeneity of regression slopes
3 of 8
What is an independence of the covariate and treatment effect?
The covariate should not be different across the groups in the analysis (If you did an ANOVA or T-test using the groups as the independent variable and the covariate as the outcome, this analysis should be non sig.
4 of 8
What is the homogeneity of the regression slopes?
Fit a regression line to the entire data set, ignoring to which group a person belongs. We should therefore assume that the overall relationship is true for all groups of participants.
5 of 8
When are planned contrasts used?
generated specific hypotheses before the experiment use planned contrasts;
6 of 8
When are post hocs used?
When there is not a generated hypothesis
7 of 8
What is affected by including a Covariate?
The error mean square, between mean square and the f ratio
8 of 8

Other cards in this set

Card 2

Front

What is another purpose of including covariates in ANOVA?

Back

Elimination of confounds, once a possible confounding variable has bee identified it can be measured and entered into the analysis as a covariate

Card 3

Front

What are the two additional considerations of an ANCOVA?

Back

Preview of the front of card 3

Card 4

Front

What is an independence of the covariate and treatment effect?

Back

Preview of the front of card 4

Card 5

Front

What is the homogeneity of the regression slopes?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Psychology resources:

RM
See all Psychology resources »See all ANCOVA resources »