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The purpose of this note is to show that in a widely cited paper by Yakir[Ann. Statist. 25 (1997) 2117--2126, doi:10.1214/aos/1069362390], the proofthat the so-called modified Shiryayev--Roberts procedure is exactly optimal isincorrect. We also clarify the issues involved by both mathematical argumentsand a simulation study. The correctness of the theorem remains in doubt.

Comments on “A note on optimal detection of a change in distribution,” by Benjamin Yakir