In a previous thread, it was discussed whether SBR was worthwhile. Here is some algebra that may make you think again.
Probability a bomber is shot down = 1/6 (denoted F)
Probability a bomber survives = 5/6 (denoted S)
Average IPC damage (providing bomber is not) = 3.5
As correctly pointed out, the expected (average) IPC damage a bomber will do before being shot down is 17.5 IPC’s.
However, the calculation that follows determines the probability that the bomber will make a profit (ie cause more than 15 IPC’s of damage before dying).
Shot down__Profit/Loss_Probability
on round
1__________-15_________0.1667
2__________-11.5_______0.1389
3__________-8.0________0.1157
4__________-4.5________0.0965
5__________-1.0________0.0804
Sum____________________0.5982
6__________+2.5________0.0670
6_________+21_________0.3349
Sum____________________0.4019
It should be noted that any one bomber has a 59.8% chance of surviving less than 4 rounds, and thus making a net loss of IPC’s.
The expectation value is scewed by the high profit if the bomber is not shot dwon by round 6, but as you can see, the probability of this happening is rather low (1/3).
This is an interesting facet of SBR not highlighted by many people. So, unless you have a large number of bombers to average out the results, you only have a percentage chance of making a profit.
Hope that helps
Stu
PS sorry about the table - hope that works.
[ This Message was edited by: Desert_Viper on 2002-03-28 05:56 ]
[ This Message was edited by: Desert_Viper on 2002-05-13 13:16 ]