Correlation and Correlation Coeifficent

Correlation and Correlation Coeifficent

Article: Estimating premorbid IQ from the demographic variables: A comparison of a regression equation vs clinical judgement, Crawford et al.

1. What is the correlation between IQ from regression equation and obtained IQ?
2, What is the correlation between IQ estimated by rater 4 and obtained IQ, and how do these compare?
3. What values can a correlation coefficient take?
4. What are my practical implications?

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