PSD of an interaction of explanatory variables (PSD-IEV)

Usage

psd_iev(discdata, spzone, wt)

Arguments

discdata: Observed data with discrete explanatory variables. A tibble or data.frame .
spzone: Fuzzy overlay spatial zones. Returned from st_fuzzyoverlay().
wt: Spatial weight matrix

Value

The Value of PSD-IEV

Details

\(\phi = 1 - \frac{\sum_{i=1}^m \sum_{k=1}^{n_i}N_{i,k}\tau_{i,k}}{\sum_{i=1}^m N_i \tau_i}\)

References

Yongze Song & Peng Wu (2021) An interactive detector for spatial associations, International Journal of Geographical Information Science, 35:8, 1676-1701, DOI:10.1080/13658816.2021.1882680

Author

Wenbo Lv lyu.geosocial@gmail.com

Examples

data('sim')
wt = inverse_distance_weight(sim$lo,sim$la)
sim1 = dplyr::mutate(sim,dplyr::across(xa:xc,\(.x) st_unidisc(.x,5)))
sz = st_fuzzyoverlay(y ~ xa + xb + xc, data = sim1)
psd_iev(dplyr::select(sim1,xa:xc),sz,wt)
#> [1] 0.8323896