Correlation Flashcards

1
Q

correlation

A

assesses the degree to which scores on two variables are related

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2
Q

correlation coefficient (r)

A

index of the extent to which two variables are linearly correlated (strength)

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3
Q

Pearson’s Product-moment correlation coefficient (r)

A

used when there is a (1) linear monotonic relationship with no outliers and must be measured on (2) interval scales

report
was the correlation significant?
was the correlation positive/negative, weak/moderate/strong?
what were the variables?
r(N-2) = [r-value], p = [p-value]
what does this suggest?
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4
Q

spearman’s rank correlation coefficient (rs)

A

monotonic but non linear (curved graph) or if there are outliers
non-monotonic (u-shaped) - different analysis

report
explain why Rs if being used (outliers, non-linear)
strength and direction of relationship
variables investigating
what test was used (spearman’s rank correlation coefficient)
rs(N-2) = [Rs-value], p = [p-value]
what does this suggest?

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5
Q

partial correlation

A

used when you want to control for a ‘third variable’
measured the strength of relationship whilst controlling for a third variable

report
what kind of correlation analysis used?
what is it measuring (strength between two variables - list variables)
what was it controlling for?
significance, direction and strength?
r(df) = [r-value], p = [p-value]
what does this suggest
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