lctools (version 0.2-10)

acc: Spatial Interaction Models: Destination Accessibility

Description

Destination accessibility or centrality or competition is a variable that when added to a destination choice model forms the competing destinations choice model. A simple formula for this variable is: $$A_j = \Sigma ( W_m / D_{jm} ) | m<>j $$ where \(A_j\) is the potential accessibility of destination \(j\) to all other potential destinations \(m\), \(W_m\) is a weight generally measured by population, and \(D_{jm}\) is the distance between \(j\) and \(m\).

Usage

acc(X, Y, Pop, Power=1)

Value

AccMeasure

a single column numeric matrix of accessibility scores

Arguments

X

a numeric vector of x coordinates

Y

a numeric vector of y coordinates

Pop

a numeric vector of the weights, usually a population variable

Power

a power of the distance; default is 1

Author

Stamatis Kalogirou <[e-mail]>

References

Kalogirou, S. (2003) The Statistical Analysis and Modelling of Internal Migration Flows within England and Wales, PhD Thesis, School of Geography, Politics and Sociology, University of Newcastle upon Tyne, UK. https://theses.ncl.ac.uk/jspui/handle/10443/204

Kalogirou, S. (2016) Destination Choice of Athenians: an application of geographically weighted versions of standard and zero inflated Poisson spatial interaction models, Geographical Analysis, 48(2),pp. 191-230. DOI: 10.1111/gean.12092 https://onlinelibrary.wiley.com/doi/abs/10.1111/gean.12092

Examples

data(GR.Municipalities)
attr<-GR.Municipalities@data
aMeasure<-acc(attr$X[1:100], attr$Y[1:100],attr$PopTot01[1:100],1)