Impact Factors

  •   What is an Impact Factor?
- A way to rank and rate journals.
  •   What does it mean?
- It is a measure of the frequency with which the "average article" in a journal has
been cited

Calculating Impact Factors for a Journal in 2003
For this example, the impact factor is the sum of all citations in 2003 to all articles published in that journal
in 2001 plus the sum of all citations to published articles in 2002, divided by the sum of all articles published
in 2001 plus the sum of all articles published in 2002.

Number of articles published in:          

Citations in 2003 to articles published in:  

Calculation:       Citations to recent articles:
       Number of recent articles:        

Who uses Impact Factors?

- Hospital Administrators
- Advisory Committees
- Other Scientists

We judge others work and our own, in part, using the Impact Factor.  Hospital Administrators may use them to
assign raises and promotions.  Advisory committees throughout Asia come to the same conclusion:  To improve a
University, Hospital or Department, hire scientists who publish in Journals with higher Impact Factors.

But don't lose sight of the fact that you must still publish!  Don't risk it all for a Science or Nature paper.

Impact Factor Listings
Available from Thompson Scientific
Writing Resources Home
2002 = 310
2001 =
Sum:     616
2002 = 4223
2001 =
Sum:     9426

9426 = 15.3