Could also take a look at the dbmss package and related publications.  I
recently used their M(r) function for something similar to what you
describe.

Marcon, E., Puech, F. & Traissac, S. (2012b). Characterizing the relative
spatial structure of point
patterns. International Journal of Ecology, 2012, 1–11.

Marcon, E. and Puech, F.  2012.  A Typology of distance-based measures of
spatial concentration

both of which are available online

Allen Aven, Ph.D. Candidate
Dauphin Island Sea Lab
101 Bienville Blvd.
Dauphin Island, AL  36528
251-861-2141 x7547
allenaven@gmail.com - http://merl.disl.org/

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