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'Surdispersion' 
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J. Denis ; J. Vaillant | 1985article/chapitre/communication
Procedures for testing homogeneity of proportions, in the presence of over-dispersion or under-dispersion, occurring in several groups in toxicology (teratology or mutagenicity) or other similar fields, are developed. We consider C(alpha) (Neyma[...]article/chapitre/communication
J. Vaillant ; S. Derridj | 1989article/chapitre/communication
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D. Bohning | 1994This note discusses an error occurring in a test for Poisson overdispersion suggested by Tiago de Oliveira (1965). The limiting null distribution of the suggested statistic is neither pivotal nor is it standard normal. The error lies in the comp[...]article/chapitre/communication
article/chapitre/communication
J. Perry ; L. Winder ; J. Holland ; R. Alston | 1999A new index and four new graphical displays, termed ''red-blue'' plots, are presented to study and measure clustering in spatially referenced count data. The index can detect clusters in the form of patches, comprising several nearby large count[...]article/chapitre/communication
article/chapitre/communication
A. Cowling | 1998Line transect surveys have traditionally been used only to estimate the mean intensity of an underlying spatial point process. In this paper, we propose a test for complete spatial randomness and a method of estimating the clustering parameters [...]article/chapitre/communication
J. Vaillant ; N. Hawlitzky | 1990article/chapitre/communication
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J. Vaillant | 1994article/chapitre/communication
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