Pearson Correlation Coefficient
Ratings prediction formula
Out of the 84601 users who received at least one statement,
67511 are 0-controversial,
17090 users (more than 20%) are 1-controversial (at least one user disagrees with the others),
1247 are at least 10-controversial,
144 are at least 40-controversial
and one user is 212-controversial
(0.8 * 0.6) + (1.0 * 0.9) / 0.8 + 1.0 = 0.767
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