The ha-index is a new revolutionary index to measure the impact of a researcher.

• It is computed by taking her (his) height in centimeters and substracting 100. For women, 12 is added to the obtained value.
  
• Degrees
  • An ha-index between 80 and 85 is considered to be excellent.
  • An ha-index higher than 85 is too good.
  • An ha-index lower than 70 needs to be improved.
• The main advantages of the ha-index over other indices:
  • very easy to compute (compared with others described for example here)
    
  • gives much better estimates of a researchers impact than others
    
  • in a research group this parameter clearly indicates the visibility of the researcher. The higher your index the more you stand out of the crowd.
    
  • chinese research will have troubles to catch up
    
  • confuses american and maybe british researchers not used to centimeters
    
  • allows to detect excellence quit early in life (thanks Benoit Marx)
• Seen on Quora
• To not be confused with the hA-index which is much less useful.
• Some estimates of ha-indices
  • Corona V.: -99,9999999 (very roughly)
  • Didier R.: no idea (h-index 178 (!, going up every day) according to Google Scholar)
  • Ike Antkare: -100
  • Alexander Boris de Pfeffel J.: 75 (only)
  • Wilfred Lawrie Nicholas J.: -45 (estimate, going up almost every week)
  • Priti P.: 64 (watch here how to improve your ha-index)
  • Nigel F.: 73 (Sorry, not excellent !)
  • Vladimir P.: 69 or 70 (only he knows exactly)
  • Barack O.: 85
  • Emmanuel M.: 73
  • Donald T.: 89 (really ?)
  • Ivanka T.: 92 (really ?)
  • Mike B.: 73 (according to Donald T.)
  • Abraham L.: 93
  • Angela M.: 85
  • Marine L.P.: 86
  • Nicolas S.: 68 (watch here and here how to improve you ha-index)
  • François H.: 74
  • Dominique de V.: 93
  • Tomas Vojnar: 83
  • Thomas Colcombet: 92
  • Olivier Serre: 90
  • Mihaela Sighireanu: 81
  • Tayssir Touili: 87
  • Carsten Kern: 102 (Are you better than that ?)
  • Roland Meyer: 81
• If you TOO want to refer to YOUR ha-index, please link to this page.
  
• Check out Twitter for amazing feedback about the ha-index
  
• The ha-index is used already by a lot (last year alone the number of people using the ha-index has increased by a staggering 50% !) of famous people.
  Here are a few:
• Rodrigo Berriel
• Vince Barany
• Morgane Cure
• Normann Decker
• Nathanael Fijalkov
• Felix Freiling (?)
• Holger Hermanns
• Jan Kretinsky
• Tomas Vojnar