Provides a sample function for
gpe_sample(sampfrac = 0.5)
Returns a function that takes an
n argument for the number of observations and a
weights argument for the case weights. The function returns a vector of indices.
Friedman, J. H., & Popescu, B. E. (2008). Predictive learning via rule ensembles. The Annals of Applied Statistics, 2(3), 916-954.
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