Discussion by J.A. Hartigan

  • Eric D. Feigelson
  • G. Jogesh Babu


I was delighted with this article, which reviewed statistical techniques used in astronomy for detecting clusters. I will concentrate on the main problem discussed by Beers, the identification of clusters in the projected positions of galaxies on the sky.


Minimum Span Tree American Statistical Association Galaxy Cluster Single Linkage Cluster Projected Position 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag New York, Inc. 1992

Authors and Affiliations

  • Eric D. Feigelson
    • 1
  • G. Jogesh Babu
    • 2
  1. 1.Department of Astronomy and AstrophysicsPennsylvania State UniversityUSA
  2. 2.Department of StatisticsPennsylvania State UniversityUSA

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