Download presentation

Presentation is loading. Please wait.

Published byArnold Baynes Modified about 1 year ago

1
Measuring Science (II) Morten Brendstrup-Hansen

2
No science without scientific publications Scientific publications are direct and tangible products of scientific activity Therefore, the idea of a measure of scientific performance based on publications is sound and straightforward

3
Peer review vs. bibliometric analysis Peer review may be accurate, but is time consuming and may easily be (suspect of being) biased The accuracy of a scholarly founded formal bibliometric analysis may be examined and its validity may be discussed A bibliometric analysis is based on publicly available (and easily collected) data

4
In bibliometrics, what should we count/calculate? Where do we find the data for bibliometric analyses?

5
Total number of papers Measures quantity, but does not take quality into account; does not give due weight to influence

6
Number of 'quality papers' e.g. defined as papers in ISI-journals Relies on the inclusion in a particular journal as a measure of quality instead of trying to assess the actual quality of the paper

7
Total number of citations Measures influence, but may be inflated by a small number of unrepresentative big hits

8
Number of citations per paper Punishes productivity

9
Number of papers with >x citations Combines publication data with citation data Thus rewards quality as well as quantity if a fair value of x is chosen, but different values of x need to be decided upon for different fields of research

10
h-index A scientist has the index h if h of his or her papers have at least h citations each - Hirsch JE (2005) PNAS 102(46): Nc Np h h

11

12

13

14

15

16

17
h-index A scientist has the index h if h of his or her papers have at least h citations each - Hirsch JE (2005) PNAS 102(46): Nc Np h h

18
g-index A set of papers has a g-index g if g is the highest rank such that the top g papers have, together, at least g 2 citations - Egghe L (2006) Scientometrics 69(1):

19
This is only the beginning More indices will probably be coined Indices should be validated e.g. by testing their predicative power

20
Software link Publish or Perish is a piece of software that calculates several bibliometric indices from Google Scholar data. It is provided free of charge at

Similar presentations

© 2016 SlidePlayer.com Inc.

All rights reserved.

Ads by Google