The Annals of Statistics
- Ann. Statist.
- Volume 43, Number 5 (2015), 1865-1895.
Optimal detection of multi-sample aligned sparse signals
We describe, in the detection of multi-sample aligned sparse signals, the critical boundary separating detectable from nondetectable signals, and construct tests that achieve optimal detectability: penalized versions of the Berk–Jones and the higher-criticism test statistics evaluated over pooled scans, and an average likelihood ratio over the critical boundary. We show in our results an inter-play between the scale of the sequence length to signal length ratio, and the sparseness of the signals. In particular the difficulty of the detection problem is not noticeably affected unless this ratio grows exponentially with the number of sequences. We also recover the multiscale and sparse mixture testing problems as illustrative special cases.
Ann. Statist., Volume 43, Number 5 (2015), 1865-1895.
Received: December 2014
Revised: February 2015
First available in Project Euclid: 3 August 2015
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Chan, Hock Peng; Walther, Guenther. Optimal detection of multi-sample aligned sparse signals. Ann. Statist. 43 (2015), no. 5, 1865--1895. doi:10.1214/15-AOS1328. https://projecteuclid.org/euclid.aos/1438606847