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SUMMARY:Corrections to a class of methods for inferring species trees from
  gene trees - Jewett\, E (Michigan)
DTSTART:20110621T145000Z
DTEND:20110621T151000Z
UID:TALK31801@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Although many methods for inferring species trees from gene tr
 ees while taking into account gene tree/species tree discordance provide c
 onsistent estimates of the species tree topology\, many do not estimate br
 anch lengths or are computationally slow. Exceptions include the GLASS met
 hod of Mossel and Roch (2010)\, the STEAC method of Liu et al. (2009)\, an
 d the Shallowest Divergence method of Maddison and Knowles (2006). Given e
 stimated gene trees for a set of loci\, these methods estimate the diverge
 nce time between a pair of taxa by computing either the mean or minimum in
 terspecific coalescence time between the taxa at each locus\, and then tak
 ing either the mean or minimum of these times across all loci. The species
  tree is then constructed by applying a suitable hierarchical clustering m
 ethod to the estimated divergence times. These methods estimate both speci
 es tree topologies and branch lengths and are computationally fast. Howeve
 r all of these methods systematically overest imate divergence times. We d
 erive corrections that can substantially reduce the bias and mean squared 
 error in the estimates of divergence times made by these methods and by a 
 fourth method based on the same principle.\n
LOCATION:Seminar Room 1\, Newton Institute
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