Fast, Caleb C.Hicks, Illya V.2017-08-012017-08-012017Fast, Caleb C. and Hicks, Illya V.. "A Branch Decomposition Algorithm for the p-Median Problem." <i>INFORMS Journal on Computing,</i> 29, no. 3 (2017) INFORMS: 474-488. https://doi.org/10.1287/ijoc.2016.0743.https://hdl.handle.net/1911/96011In this paper, we use a branch decomposition technique to improve approximations to the p-median problem. Starting from a support graph produced either by a combination of heuristics or by linear programming, we use dynamic programming guided by a branch decomposition of that support graph to find the best p-median solution on the support graph. Our results show that when heuristics are used to build the support graph and the support graph has branchwidth at most 7, our algorithm is able to provide a solution of lower cost than any of the heuristic solutions. When linear programming is used to build the support graph and the support graph has branchwidth at most 7, then our algorithm provides better solutions than popular heuristics and is faster than integer programming. Thus, our algorithm is a useful practical tool when support graphs have branchwidth at most 7.engThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by INFORMS.Journal articleFacility Locationp-MedianBranch DecompostionDynamic ProgrammingPaper_FINALhttps://doi.org/10.1287/ijoc.2016.0743