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  1. guava/src/com/google/common/math/PairedStatsAccumulator.java

        //               = x_n y_n - X_n y_n - x_n Y_{n-1} + X_n Y_{n-1}
        //               = (x_n - X_n) (y_n - Y_{n-1})
        xStats.add(x);
        if (isFinite(x) && isFinite(y)) {
          if (xStats.count() > 1) {
            sumOfProductsOfDeltas += (x - xStats.mean()) * (y - yStats.mean());
          }
        } else {
          sumOfProductsOfDeltas = NaN;
        }
        yStats.add(y);
      }
    
      /**
    Registered: Fri Sep 05 12:43:10 UTC 2025
    - Last Modified: Mon Apr 14 16:36:11 UTC 2025
    - 10.4K bytes
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