1 Each Yi
is obtained by repeatedly generating a random distance Yij
with its corresponding probability Z(Yij) , and a
random number Rj (0 Rj 1/(2)) until the first occurrence of
Z(Yij) Rj, which indicates an
acceptable Yi. As the distribution of all
Yi builds up, the tails rapidly become fixed and the `bell'
gets taller, but relative areas under the graph remain the same (e.g. 95% of
the area lies within ±1.96).