# card

0th

Percentile

##### Cardinalities for neighbours lists

The function tallies the numbers of neighbours of regions in the neighbours list.

Keywords
spatial
##### Usage
card(nb)
##### Arguments
nb
a neighbours list object of class nb
##### Details

“nb” objects are stored as lists of integer vectors, where the vectors contain either the indices in the range 1:n for n as length(nb) of the neighbours of region i, or as.integer(0) to signal no neighbours. The function card(nb) is used to extract the numbers of neighbours from the “nb” object.

##### Value

An integer vector of the numbers of neighbours of regions in the neighbours list.

##### References

Bivand R, Pebesma EJ, Gomez-Rubio V, (2008) Applied Spatial Data Analysis with R, Springer, New York, pp. 239-251; Bivand R, Portnov B, (2004) Exploring spatial data analysis techniques using R: the case of observations with no neighbours. In: Anselin L, Florax R, Rey S, (eds.), Advances in Spatial Econometrics, Methodology, Tools and Applications. Berlin: Springer-Verlag, pp. 121-142.

summary.nb

• card
##### Examples
example(columbus)
table(card(col.gal.nb))

Documentation reproduced from package spdep, version 0.6-9, License: GPL (>= 2)

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