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The idea of constructing a multistage pattern classification system with reject option is presented and conditions in terms of upper bounds of the cost of higher-stage measurements for a multistage classifier to give lower decision risk than a single-stage classifier are derived.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Pudil et al. (2003) studied this question.