Molecular Biology and Evolution impact factor: the MEGA effect Updated

Almost 2 years ago, I calculated how the very high impact factor of Molecular Biology and Evolution was entirely due to one paper, reporting the software MEGA: Molecular Biology and Evolution impact factor: the MEGA effect. A recent Twitter exchange prompts me to update these numbers. Spoiler: the MEGA effect has grown.

Reminder of the 2013 numbers:

  • Cites in 2012 to items published in: 2011 = 3807; 2010 = 1939
  • Number of items published in: 2011 = 297; 2010 = 258

The MEGA5 paper was cited 2473 times in 2012, so updating the numbers, we get:

  • 3807-2473+1939 = 3273 cites
  • 297-1+258 = 554 items
  • thus 3273/554 = 5.9 impact factor.

Updated in March 2015:

  • Cites in 2013 to items published in: 2012 = 1800; 2011 = 6656
  • Number of items published in: 2012 = 294; 2011 = 297

The MEGA5 paper was cited 5052 times in 2013, so updating the numbers, we get:

  • 1800+6656-5052 = 3404 cites
  • 294+297-1 = 590 items
  • thus 3404/590 = 5.8 impact factor.

Instead of an IF of 14 with MEGA. Yipee.

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2 réponses à Molecular Biology and Evolution impact factor: the MEGA effect Updated

  1. Björn Brembs dit :

    How do you get your IF from 7 to almost 12 without changing anything? Just ask TR to not count some of your papers:
    http://blogarchive.brembs.net/comment-n817.html

  2. Iddo Friedberg dit :

    Since you didn’t calculate it to the third decimal place, your math is invalid. 🙂

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