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Table 1 Rule for interpreting the strength of a correlation coefficient

From: Validating ORR and PFS as surrogate endpoints in phase II and III clinical trials for NSCLC patients: difference exists in the strength of surrogacy in various trial settings

Size of Correlation (absolute value)

Interpretation

[0.90,1.00]

Very high positive (negative) correlation

[0.70,0.90)

High positive (negative) correlation

[0.50,0.70)

Moderate positive (negative) correlation

[0.30,0.50)

Low positive (negative) correlation

[0.00,0.30)

Negligible correlation