[R-sig-eco] Count data

mujeeb rahman mujeebrahmanp at gmail.com
Fri May 1 05:30:58 CEST 2009


Hi All
I am currently working on soil fauna, abundance of soil macrofauna
from different habita. Due to the overdispersion, the abundance (count
data) contains many extreme values (zeroes as well as 100s..!!!).

The data contains abundance soil fauna from 15 landuse type (coming
under four ecosystems), for each landuse type I have 4 spatially
different plots. I each plot 4 random soil monoliths are taken and
soil fauna were counted.

I think it is a nested model, monoliths are nested in plot, plots are
nested in landuse. Poisson, NBD of Zeroinflated NBD models may be
appropriate, but must be validated. Is there were any provision to
conduct such analysis in R?. If so please give me details of package
or examples, if any.

A line of communication is greatly appreciated, which is worthful..

Thanking all
Mujeeb Rahman P
KFRI, Peechi, Thrissur, Keraka, India



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