Correlations

Question 1

Define correlations

Answer 1

looking at the relationship between variables

Question 2

Describe Pearsons Product Moment Correlation coefficient (Pearsons’r)

Answer 2

• range of 1 to -1 called a coefficient
• it simply tells us two things about the relationship between two variables
• direction and strength of the relationship

Question 3

what are the elements of a relationship?

Answer 3

• a correlation coefficient gives us a measure of strength of the relationship
• how much the variables vary together
• the further the score away from 0 the stronger the relationship

Question 4

Describe Kendall’s Tau

Answer 4

works well with small data sets with lots of tied ranks
- preferred by staticians
- non parametric alternative

Question 5

describe Spearman’s correlation coefficient

Answer 5

works well with large data sets (with fied tied ranks)
- rank each data set then correlate rank
- no normality assumption