ANOVA (Lecture 8)

Question 1

What are the two types of ANOVA?

Answer 1

1. Univariate - One variable

2. Multivariate - More than one variable

Question 2

What is the main assumption of the linear model?

Answer 2

That the treatment effects every EU in the same way

Question 3

What is a variable?

Answer 3

What is measured

Question 4

What is a factor?

Answer 4

the effect under investigation

Question 5

What are the two sources of variation?

Answer 5

1. Between sample sites (treatment effect)

2. Within sites (error)

Question 6

What does LSD stand for?

Answer 6

Least Significant Difference

Question 7

What test can you use for multiple comparisons?

Answer 7

Tukey. Used to compare critical LSD to calculated distance between means.
Ho: There is no difference between the treatment means

Question 8

What are the 3 assumptions of the ANOVA?

Answer 8

1. Normality (Normal Q-Q Plot, Shapiro normality)
2. Independence (residual vs fitted plot)
3. Homogeneity of variance (Levenes test)

Question 9

What is the purpose of a multi-way ANOVA?

Answer 9

When determining weather two or three factors interact. Do they act together to produce a greater or lesser effect then if they acted independently?