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For audio engineers, the might refer to a preamp or converter chip. The "best" version is defined by its total harmonic distortion plus noise (THD+N) rating. Leading units achieve less than 0.0005% THD+N, preserving the purity of the original recording without adding coloration or hiss.

In data science, when researchers try many different algorithms and select the one with the best performance on a sample dataset, there is a high risk that the selected algorithm only looks good due to random noise in that specific sample (overfitting). This paper provides a rigorous method to estimate the true accuracy of that "best" algorithm on the underlying population. waaa087 best