In many binary classification applications, such as disease diagnosis and spam detection, practitioners commonly face the need to limit type I error (i.e., the conditional probability of misclassifying a class 0 observation as class 1) so that it remains below a desired threshold. To address this need, the NeymanPearson (NP) classification paradigm is a natural choice; it minimizes type II error (i.e., the conditional probability of misclassifying a class 1 observation as class 0) while enforcing an upper bound, alpha, on the type I error. Although the NP paradigm has a centurylong history in hypothesis testing, it has not been well recognized and implemented in classification schemes. Common practices that directly limit the empirical type I error to no more than alpha do not satisfy the type I error control objective because the resulting classifiers are still likely to have type I errors much larger than alpha. As a result, the NP paradigm has not been properly implemented for many classification scenarios in practice. In this work, we develop the first umbrella algorithm that implements the NP paradigm for all scoringtype classification methods, including popular methods such as logistic regression, support vector machines and random forests. Powered by this umbrella algorithm, we propose a novel graphical tool for NP classification methods: NP receiver operating characteristic (NPROC) bands, motivated by the popular receiver operating characteristic (ROC) curves. NPROC bands will help choose in a data adaptive way and compare different NP classifiers.
Package details 


Author  Yang Feng, Jingyi Jessica Li and Xin Tong 
Date of publication  20180213 15:42:28 UTC 
Maintainer  Yang Feng <[email protected]> 
License  GPL2 
Version  2.1.1 
URL  http://advances.sciencemag.org/content/4/2/eaao1659 
Package repository  View on CRAN 
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