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This function computes the frequency-specific variance ratio for a community in a single plot.
vrf(X)
a matrix with counts or densities arranged in species by time step
vrf returns a list consisting of
vrf
a vector from 0 to 1 (not including 0 and 1)
a vector of frequency-specific or frequency-decomposition of VR
<Lei's paper>
vr
# NOT RUN { X<-matrix(runif(200,1,100), 10, 20) ans<-vrf(X) # }
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