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Tracking Chandra Science Productivity

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Tracking Chandra Science Productivity. Publication Metrics. special thanks to. Mihoko Yukita (CDO) ... ( News articles, Press releases, funding...) Which Metrics? ... – PowerPoint PPT presentation

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Title: Tracking Chandra Science Productivity


1
Tracking Chandra Science Productivity
  • Publication Metrics

Paul J. Green (CDO)
special thanks to Mihoko Yukita (CDO) Sherry
Winkelman (Archive Group)
2
Why Use Publications?
  • An accepted measure of scientific productivity.
  • Existing databases (e.g., ADS) allow trackable,
    reproducible statistics.
  • Comparisons can be made to other observatories.
  • What else is there? (News articles, Press
    releases, funding)

3
Which Metrics?
  • PhD dissertations
  • papers
  • citations
  • pages
  • including
  • all publications
  • refereed papers
  • highly cited papers
  • certain journals

4
Chandra Bibliography Database
See Archive Group presentation A. Rots
  • Queries the ADS daily.
  • Requires human scanning, culling, and
    categorization.
  • Allows searching and statistics.
  • Database now current and backfilled to launch.
  • Plans for public search page soon, with links to
    related data.

5
(No Transcript)
6
TOTALS BY YEAR
  • Refereed only
  • All proposal types GO, GTO, TOO, DDT
  • (no CAL)
  • Statistics through 18 Dec 2003
  • Colored by paper category

7
S(Chandra Papers published that year)
Illustrates ramp-up in operations, archive size,
user familiarity
8
S(Citations in that year to all previous Chandra
Papers)
Same ramp-ups convolved with publication-to-citati
on delay.
9
MEANS BY YEAR
  • Refereed, Category 1 only
  • All proposal types GO, GTO, TOO, DDT
  • (no CAL)
  • Statistics through 18 Dec 2003
  • Colored by paper category
  • N.B. multiple countings

10
S(Papers published in each year)/ S(Targets used
in those Papers)
11
Comparisons
  • Comparing to other scopes is tricky, e.g.,
  • Whos the audience?
  • Whats the purpose?
  • How do you normalize paper or citation counts ?
  • aperture area? (meaningless across
    wavelengths)
  • program dollars? (space vs. ground!)
  • photons?
  • pointings!
  • HST has 15x the citation impact of a 4-m
  • ground-based telescope, but costs 100x as much.
  • Benn Sanchez 2001, PASP, 113

12
Doctoral Theses
  • Searching the dissertation abstracts
  • http//lib.harvard.edu/e-resources/details/d/dissa
    bst.html
  • as of 22 Dec 2003
  • Year Chandra AND HST OR
  • X-ray Hubble Space Telescope
  • 1999 1 7
  • 2000 5 10
  • 2001 9 5
  • 2002 9 6
  • 2003 7 4
  • TOTAL 31 32

13
Other Trends for Study
  • The CXC Archive group database also allows study
    of publication metrics by
  • journal (e.g., Nature citation rate 8x ApJ)
  • most-cited papers
  • observation type (DDT, TOO, LP, VLP)
  • subject area
  • PI institution
  • proposal grade
  • These all take effort!

14
Upcoming Public Metrics Page
  • Simple statistics, updated monthly
  • Omit inter-telescope comparisons
  • Links to Chandra Bibliography Database
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