Internal
besag_newell_internal(observedCases, expectedCases, nearestNeighborsList,
nZones, k)
observed cases for each area
Expected cases for each area
number of single zones
max number of cases in each
Besag J. and Newell J. (1991) The Detection of Clusters in Rare Diseases Journal of the Royal Statistical Society. Series A (Statistics in Society), 154, 143--155