8: Correlations & Partial Correlations Flashcards
1
Q
What is the non-parametric equivalent to the correlation?
A
spearman’s rho = >20 cases
kendall’s tau = <20 cases
2
Q
what is a bivariate linear correlation
A
correlation examining the relationship between 2 variables
3
Q
what does the correlation coefficient (r) show?
A
a measure of the strength of association between the two variables
4
Q
what is covariance?
A
a measure of the variance shared between our x and y variables
5
Q
what are the df for r?
A
n-2
6
Q
what is shared variance?
A
expresses the proportion of the separate variances for our 2 variables that is shared
7
Q
how do you calculate shared variance?
A
r^2
8
Q
what is the statistical value for effect size for correlations?
A
r^2 - It tells us how much of the variance in y can be ‘explained by’ x
