Figure 8.

Permutation test of the three pulmonary nodule groups. The number of tests is 200; the X-axis represents the correlation between the random group Y and the original group Y, and the Y-axis represents the scores of R2 and Q2. The rightmost is the real value, and the left is the simulated value. The Q2 value of all the blue on the left is lower than the original point on the right, the R2 value of all the green on the left is lower than the original point on the right, and the intercept of the regression line of Q2 is <0.05.