gw.glm.cv {lctools}

A specific version of the function gw.glm

Description

A specific version of the function gw.glm returning only the leave-one-out Cross Validation (CV) score. gw.glm.cv exludes the observation for which a sub-model fits.

Usage

gw.glm.cv(bw, formula, family, dframe, obs, kernel, dmatrix)

Arguments

bw

a positive number that may be an integer in the case of an "adaptive kernel" or a real in the case of a "fixed kernel". In the first case the integer denotes the number of nearest neighbours, whereas in the latter case the real number refers to the bandwidth (in meters if the coordinates provided are Cartesian).

formula

the local model to be fitted using the same syntax used in the glm function in R. This is a sting that is passed to the sub-models' glm function. For more details look at the class formula.

family

a description of the error distribution and link function to be used in the local model as in the glm function. Currently the only option tested is "poisson".

dframe

a numeric data frame of at least two suitable variables (one dependent and one independent)

obs

number of observations in the global dataset

kernel

the kernel to be used in the regression. Options are "adaptive" or "fixed". The weighting scheme used here is defined by the bi-square function (weight = (1-(ndist/H)^2)^2 for distances less than or equal to H, 0 otherwise)

dmatrix

eucledian distance matrix between the observations

Details

Only used by gw.glm.bw

Value

Leave-one-out Cross Validation (CV) score

Author(s)

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

See Also

gw.glm.bw