title: FastLSU: a more practical approach for the Benjamini-Hochberg FDR controlling procedure for huge-scale testing problems.
abstract: We address a common problem in large-scale data analysis, and especially the field of genetics, the huge-scale testing problem, where millions to billions of hypotheses are tested together creating a computational challenge to control the inflation of the false discovery rate. As a solution we propose an alternative algorithm for the famous Linear Step Up procedure of Benjamini and Hochberg.
  
  
  
  Our algorithm requires linear time and does not require any P-value ordering. It permits separating huge-scale testing problems arbitrarily into computationally feasible sets or chunks Results from the chunks are combined by our algorithm to produce the same results as the controlling procedure on the entire set of tests, thus controlling the global false discovery rate even when P-values are arbitrarily divided. The practical memory usage may also be determined arbitrarily by the size of available memory.
  
  
  
  R code is provided in the supplementary material.
  
  
  
  sbatista@cs.princeton.edu
  
  
  
  Supplementary data are available at Bioinformatics online.
authors.affiliation: Statistical and Applied Mathematical Sciences Institute, Research Triangle Park, NC 27709, USA and.
authors.forename: Vered
authors.initials: V
authors.lastname: Madar
authors.affiliation: Department of Computer Science, Princeton University, Princeton, NJ 08540, USA.
authors.forename: Sandra
authors.initials: S
authors.lastname: Batista
mesh_terms: D000465:Algorithms; D012984:Software