The author probably meant: "Pearson correlation coefficient r" instead of “correlation coefficient 𝑅^2.” The imagine appears to show the Pearson correlation coefficient r, and 𝑅^2 is the coefficient of determination (not correlation). <img width="1823" height="932" alt="Image" src="https://github.com/user-attachments/assets/1529f99a-81da-46c2-949f-5e2697327249" />
The author probably meant: "Pearson correlation coefficient r" instead of “correlation coefficient 𝑅^2.”
The imagine appears to show the Pearson correlation coefficient r, and 𝑅^2 is the coefficient of determination (not correlation).
