StephenZA
Cricket Web: All-Time Legend
We don`t know what the error of margin is on the ball tracking... is it 1mm at impact increasing to 10mm after 3m? The umpires call has nothing to do with the science or accuracy of the system but an arbitrary decision decided by a panel of non-experts that want to give umpires a margin of error. Maybe guided by experts.If the ball is shown to be just clipping the side of the stump then there's presumably a chance of a little under 50% that it would have missed completely (i.e. if it had gone any further to the right in this case).
As far as I`m aware they`ve just finished a whole series of independent tests, but this information has never been released for scrutiny by the public.