Correlation Coefficient (r)
Strength of association between different ratings of the same thing
Correlation coefficient (r) reflects the Direction and magnitude of linear association between variables
Limitations:
- Only gives info on How closely associated the numbers are (if one increases or decreases, the other does as well)
- Does NOT give info on how well those actual values agree (level of agreement?)
Scoring
Interpretation
Direction (regardless of magnitude):
- Positive correlation (+r): as one variable increases, the other variable increases
- Negative correlation (‐r): as one variable increases, the other variable decreases
- AKA inverse correlation
Magnitude (regardless of direction):
- values range from: 0.00 (no association) to 1.00 (perfect association)
- The closer (r) is to 1.00, the stronger the association between variables
Citation
For attribution, please cite this work as:
Yomogida N, Kerstein C. Correlation Coefficient
(r). https://yomokerst.com/The
Archive/Evidene Based Practice/Multivariate Data
Analysis/Correlation/correlation_coefficient.html