so by my count, there were 96 division 1s in season 10, therefore there were 92*4=368 teams who promoted into division 1 after season 10.
There were 136 teams which promoted in season 10 to division 1, who were subsequently demoted after season 11.
Therefor the average survival rate of newly promoted teams is 63.0%, just 10% less than what it would be if you thought all teams in a division were perfectly equal.
the numbers get more complicated when you look at lower divisions because although every country has a D2, not all have a D3, but 326 teams went up into 2, and then down into 3 the next season.
There were 376*4=1472 division 2s, but there were 16 countries which had no division 3... so that means 1472-(16*4)=1408 teams the promoted to division 2, making that a 76.8% survival rate.
The numbers could be off a bit due to bot promotion.. i haven't thought about it too carefully.. and i can't remember exactly whether the metric i used to detect promotions and demotions includes or doesn't include bot promotions.... but i do know the amount of bot promotion is small in the upper divisions, so i trust those numbers are not too far off.
Of course you could argue that its harder in the big countries... but particularly when you are dealing with D1 in big countries.. of which there are only a handful its going to be really tough to tell based upon N=4 or 5 what the real survival rate is..you need to look over multiple seasons.. and i'd assume your argument is that these recent changes have made it more difficult so looking over too many seasons back wouldn't be relevant.
EDIT) I was counting countries wrong, 96 exist now.. 92 existed after season 10, and only 16 countries only had 2 divisions after season 10.
Last edited by BB-Forrest at 3/29/2010 10:39:24 AM