Although often quoted as 80:20, figures from reality (in all areas of activity) are often somewhat adrift - 90:10, or 73:27.I wonder if the infected nurse in this example would come under the 80/20 rule? I am sure I have read somewhere that 20% of people infected with Covid are responsible (the super spreaders) for infecting around 80% of other people with the virus.
This 80/20 rule seems to pop up in all kinds of situations. I watch a lot of military history programmes and I think I remember seeing a stat that during the second world war 20% of fighter pilots were responsible for around 80% of the kills of enemy planes (this was in all air forces not just the British).
In many large companies just 20% of the workforce are responsible for 80% of the profit of the company (probably not easy to identify that 20% thought).
Is the 80/20 rule a thing or just a quirk of statistics and when studied in depth it doesn't actually exist?
I think it is exactly what you would expect. But in the case of covid-19, imagine a group of people all infected but at slightly different stages coming into contact with many more who are not infected. (My mind's eye has two conveyor belts going in opposite directions.) At any one instant one infected person is both closest and at the most infectious stage - they would account for the 80%. But an hour earlier or later, and a different member of the infectious might have been the top spreader. Or the most infectious person is further away from the uninfected which would reduce rate of infection.