The traffice data originally appeared in Simar 1976 where the total number of N is knowns as 9461. Recently it was re-analyzed by Bohning and Schon 2005.
Simar, L. (1976), Maximum likelihood estimation of a compound Poisson process, Annals of Statistics, 4, 1200-1209. Bohning, D., and Schon, D. (2005), Nonparametric maximum likelihood estimation of population size based on the counting distribution, Journal of the Royal Statistical Society, Series C: Applied Statistics, 54, 721-737.
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