Description Usage Arguments Details Value Functions References
Compute the spatial and non-spatial Simpson index for a given multitype point pattern.
1 2 3 |
X |
Multitype point pattern of class |
r |
Vector of sizes for neighbourhoods, e.g. |
... |
Further parametes for the function |
spatial |
If FALSE, return the classical aspatial index value. |
The form of Simpson index is S = 1 - sum pi_tau, where the sum is over the types of the pattern, and pi_tau is like
in Shimatani\& Kubota 2004.
The function simpsonF
is the main calculation function. Uses function segregationFun
.
The function simpson.index
is a shortcut to get a single value for the pattern using 4-nearest neighbours graph by default.
If spatial, returns an fv
-object, see spatstat
for more information. Otherwise a numeric value.
simpson.index
: The Spatial Simpson Index
Rajala, Illian: A family of spatial biodiversity measures based on graphs, Env. Ecol. Stat. 2012
Shimatani, Kubota: Quantitative assesment of multispecies spatial pattern with high species diversity. Ecological Research, 19, 2004.
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