## Bootstrap bias-corrected percentiles

How can I derive the acceleration $$hat{a}$$ and bias-correction $$hat{z}_0$$ used in the $$BC_a$$ method for confidence intervals?

## Tracking approximate values of specific percentiles

At the moment I use HdrHistogram to track approximate distribution of a stream of values. But I don’t really need all percentiles, just three of them. Is there some algorithm to track specific percentiles? Precise algorithm with two heaps isn’t feasible because of number of values.