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Multivariate ANOVA – Questions & Answers
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Multivariate ANOVA – Questions & Answers
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Multivariate ANOVA – Questions & AnswersWhat is 1-Way ANOVA? ✔️Ans - - used to test difference among the means
of 3+ groups
- IV = 1 nominal
- DV = 1 I/R
What is repeated measures ANOVA? ✔️Ans - - used for repeated measures
(3+) of DV on the same subjects over time OR exposure of all subjects to all
treatment conditions (3+)
- IV = 1 nominal
- DV = 1 I/R
What is 2-way ANOVA (factorial ANOVA)? ✔️Ans - - used to test main
effect of each IV on DV and test interaction b/w 2 IVs
- IV = 2 nominal
- DV = 1 I/R
What is ANCOVA? ✔️Ans - - used to test effect of IV on DV while
controlling for a covariate
- IV = 1 nominal
- DV = 1 I/R
- covariate = 1+ I/R
What is mixed-design ANOVA? ✔️Ans - - extension of repeated measures
ANOVA for 2+ groups
- IV = 2+ nominal (1 is usually time)
- DV = 1 I/R
What is MANOVA? ✔️Ans - - used to test the difference among the means
of 2+ groups for 2+ DVs simultaneously
- IV = 1+ nominal
- DV = 2+ I/R
How strongly correlated should a covariate be with DV? ✔️Ans - r > or = to
0.8 or -0.8
, Which ANOVA is most often used in RCTs with multiple outcome measures?
✔️Ans - MANOVA
ANOVA is to x as repeated-measures ANOVA is to y.
a) single sample t-test; between group t-test
b) within subject t-test; single sample t-test
c) between group t-test; within subject t-test ✔️Ans - C
Repeated-measures ANOVA is designed to decrease what type of error?
a) individual differences
b) uncontrolled environmental factors
c) unreliability of measures ✔️Ans - A
A nutritionist is studying the effects of diet on cholesterol in men and women.
She has data which reports cholesterol levels for men and women for three
different diets (low-fat low calorie, adkins diet, mediterranean diet). What
statistical test should you use to see if there's a difference in cholesterol levels
for men and women in the three diet groups? ✔️Ans - two-way ANOVA
A researcher wanted to know whether perception of a person's height
depends on his/her perceived status. A random sample of army inductees was
selected and equally divided among four groups. An actor gave a short speech
separately to each group, extolling the virtues of army life. The groups differed
as follows:
1) actor was dressed as a private
2) actor was dressed as a sergeant
3) actor was dressed as a captain
4) actor was dressed as a colonel
The inductees were asked to complete a questionnaire evaluating the speech.
As part of the questionnaire, they were asked to estimate the lecturer's height.
What statistical test would you use? ✔️Ans - one-way ANVOA
9 subjects with PTSD are measured before therapy, after therapy, and 3
months later. Do the number of symptoms decrease over therapy and remain
low?
What statistical test would you use? ✔️Ans - repeated measures ANOVA
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