For count and incidence data:
Madden LV, Hughes G. 1995. Plant disease incidence: Distributions,
heterogeneity, and temporal analysis. Annual Review of Phytopathology 33(1):
529–564.
tools:::Rd_expr_doi("10.1146/annurev.py.33.090195.002525")
Patil GP, Stiteler WM. 1973. Concepts of aggregation and their
quantification: a critical review with some new results and applications.
Researches on Population Ecology, 15(1): 238-254.