Science Advances

The PDFset includes:

• Supplementary text
• Fig. S1. Distribution of individuals’ level of accuracy and correlated decisions in the four datasets.
• Fig. S2. High-performing individuals are similar to each other, while low-performing individuals tend to make dissimilar decisions.
• Fig. S3. Decision similarity performs well for cases in which the majority decided correctly but breaks down for cases in which the minority decided correctly.
• Fig. S4. The similarity-accuracy relationship is also present when using the continuous probability forecasts.
• Fig. S5. Decision similarity permits identification of low-performing individuals.
• Fig. S6. Decision similarity permits identification of high-performing (and low-performing) individuals in small groups.
• Fig. S7. The relationship between decision similarity of a group of nine individuals and their individual and collective accuracy.
• Fig. S8. Decision similarity permits identification of low-performing groups.
• Fig. S9. In each of the four datasets, the average decision similarity to others tightly correlates with the decision similarity to the majority judgment.
• Fig. S10. Decision similarity to the majority tightly correlates with decision accuracy in breast and skin cancer diagnostics, geopolitical forecasting, and a general knowledge task.

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Other Supplementary Material for this manuscript includes the following:

• Skin cancer data set (.csv format).
• R Code numerical simulations (Fig. 2B) (.R format).