Correlation Flashcards
1
Q
What conditions must be satisfied to use the PMCC?
A
The variables must both be random
The relationship must be linear
The data must be drawn from an approximate bivariate normal distribution (ellipse)
No outliers
2
Q
What is the PMCC used for?
A
It is used to measure whether there is a correlation between two variables.
3
Q
What is the Spearman’s rank coefficient used for?What type of test is it?
A
It is used to test if there is an association between 2 variables.It is non parametric so there are no constraints.It is tested on a sample rather than population so no assumptions need to be made.
4
Q
What is the drawback of spearman?
A
It loses the information as it is ranked.
