The data show the observed number of females in 100 queues of length 10 in a London underground station. They were used by Conigliani et al. (2000) and
fitted by the zero-inflated models.
References
Conigliani, C., Castro, J. I., & O'Hagan, A. (2000). Bayesian assessment of goodness of fit against nonparametric alternatives. Canadian Journal of Statistics, 28(2), 327-342.