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Table 3 Interpretation of Pearson correlation coefficients

From: Selective measurement of α smooth muscle actin: why β-actin can not be used as a housekeeping gene when tissue fibrosis occurs

Size of correlation coefficient Interpretation
0.9 ≤ r ≤ 1 Very high positive correlation
0.7 ≤ r ≤ 0.9 High positive correlation
0.5 ≤ r ≤ 0.7 Moderate positive correlation
0.3 ≤ r ≤ 0.5 Low positive correlation
0 ≤ r ≤ 0.3 Negligible correlation