In a sharp-floor Gaussian regime, subtracting a same-sample floor estimate from retained PCR denominators makes the conditional prediction risk of dPCR vanish relative to the best ordinary PCR rank.
Roy Frostig, Cameron Musco, Christopher Musco, and Aaron Sidford
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De-floored Principal Component Regression: When Rank Selection Alone Is Insufficient for Prediction
In a sharp-floor Gaussian regime, subtracting a same-sample floor estimate from retained PCR denominators makes the conditional prediction risk of dPCR vanish relative to the best ordinary PCR rank.