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Spatial dependence between cases occurring within the same month as measured through φ(d1, d2) where d1 and d2 is the distance range between cases. The spatial range (d2−d1) was kept constant at 1 km when d2 was greater than 1 km. When d2 was less than 1 km, d1 was equal to zero. Estimates are plotted at the midpoint of the spatial ranges.
