A vector with the rate $p = \frac{X}{N}$, obtained with
sample splitting.
Details
These functions implement sample splitting of a binomial rate.
Note that the results depend on the state of the random number
generator, and are therefore not strictly deterministic.
References
Decrouez, Geoffrey, and Peter Hall. "Split Sample Methods for
Constructing Confidence Intervals for Binomial and Poisson
Parameters." Journal of the Royal Statistical Society: Series B
(Statistical Methodology), 2013, n/a–n/a. doi:10.1111/rssb.12051.