T5: Correlation Flashcards
What is correlation?
The relationship between the DV’s - it doesn’t include IVs so only predicts behaviour and to explain or infer causality
What is a positive correlation?
As one DV gets bigger as does the other
What is a negative correlation?
As one DV gets bigger the other gets smaller
What does computing a correlation do (what does it show)?
A numerical way to express correlation (statistical way)
What is the Pearson R?
It looks at relationship between DV by taking a z score for each score of each DV (x and y) and multiplying them for each participant
What does the PR show?
The correlation coefficient
What is the correlation coefficient?
Shows whether the correlation between DVs is positive/negative OR strong/weak
What does the correlation coefficient range from?
-1 to +1 and 0 which means no linear relationship
What scale must variables for the correlation coefficient be measured on?
Interval or ratio
What is a curvilinear realtionship?
The relationship between two DV when increase in x means increase in y and then drop in y
What is a curvilinear relationship shown by?
Yerkes-Dodson arousal curve
On a PR, how is a curvilinear relationship shown?
The PR will either be 0 or -1
How can you look at the correlation between three or more DVs?
Can look at any paired combinations and look at their PR correlation coefficient
What is a cross-lagged-panel-correlation procedure?
A way of dealing with the directionality problem
What does the CLPC procedure show?
A way of showing whether DV’s x=y or y=x
