Fried

This is an artificial data set used in Friedman (1991) and also described in Breiman (1996,p.139). The cases are generated using the following method:
Generate the values of 10 attributes, X₁, ..., X₁₀ independently each of which uniformly distributed over [0,1]. Obtain the value of the target variable Y using the equation:

Source: Breiman (1996, p.139).
Characteristics: 40768 cases, 10 attributes (0 nominal, 10 continuous).
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References

BREIMAN, L. (1996): Bagging Predictors. Machine Learning, 24(3), 123--140. Kluwer Academic Publishers.
FRIEDMAN, J. (1991): Multivariate Adaptative Regression Splines. Annals of Statistics, 19:1, 1--141.