Correlational Research Strategy Flashcards
Correlational research strategy graph?
- Relationship between variables is visualized in a scatterplot
- X-axis: Predictor variable
- Y-axis: Criterion variable
What is correlational research strategy?
Establish that a relationship exists
between variables.
What are the Three characteristics of a relationship in a correlational research strategy?
- Direction
- Form
- Strength
Direction in scatterplot?
- Positive – both variables change in the same direction
- Negative – variables change in opposite directions
Strength in scatterplot?
- Indicated by correlation coefficient (+1.00 thru -1.00)
- Strongest correlation = +1 or -1
- indicates a positive relationship
- indicates a negative relationship
When to use Spearman or Pearson?
Pearson when linear and Spearman when monotonic. When one cannot use either then use non-linear.
What is regression?
Using one variable to predict the other.
What is the Coefficient of determination?
r^2
What is shared variance?
Percentage of change in one variable accounted for by changing
the other variable = shared variance.
How to find the shared variance percentage?
If r^2 is equal to 0.16 than the shared variance percentage is 16%.
Advantages of correlational research? (1)
- High external validity
Disadvantages of correlational research? (1)
- Correlation ≠ Causation
- Directionality problem
Why is shared variance important?
Tells you the extent to which your variable is predictable.
What are the functions of correlational research?
- Test re-test reliability
- Concurrent validity
- Divergent validity
