1. A method for measuring a degree of association between n plurality of dimensionally referenced physical events of a pre-determined physical characteristic, said n plurality of physical events each having locations of observation, comprising the steps of: assembling n plurality of physical events each having an indicia of location and a physical characteristic above a first threshold; assembling a universe of possible sample locations; selecting n plurality of sample locations from said universe; determining a reference distribution by calculating a test statistic for each of n′ plurality of random allocations of the n plurality of physical characteristics over said n plurality of sample locations; determining a restricted distribution by calculating said test statistic for each of n″ plurality of restricted random allocations of the n plurality of physical characteristics over said n plurality of sample locations; and determining the degree of association between said n plurality of physical events based upon said determined reference and restricted distributions.