spdep (version 1.3-6)

licd_multi: Local Indicators for Categorical Data

Description

Local indicators for categorical data combine a measure of local composition in a window given by the per-observation set of neighbouring observations, with a local multi-category joincount test simplified to neighbours with the same or different categories compared to the focal observation

Usage

licd_multi(fx, listw, zero.policy = attr(listw, "zero.policy"), adjust.n = TRUE,
 nsim = 0L, iseed = NULL, no_repeat_in_row = FALSE, control = list())

Value

local_comp

data.frame object with LICD local composition columns: ID, category_i, count_like_i, prop_i, count_nbs_i, pbinom_like_BW, pbinom_unlike_BW, pbinom_unlike_BW_alt, chi_BW_i, chi_K_i, anscombe_BW

local_config

data.frame object with LICD local configuration columns: ID, jcm_chi_obs, jcm_count_BB_obs, jcm_count_BW_obs, jcm_count_WW_obs, pval_jcm_obs_BB, pval_jcm_obs_WW, pval_jcm_obs_BW

local_comp_sim

data.frame object with permutation-based LICD local composition columns: ID, pbinom_like_BW, pbinom_unlike_BW, pbinom_unlike_BW_alt, rank_sim_chi_BW, rank_sim_chi_K, rank_sim_anscombe

local_config_sim

data.frame object with permutation-based LICD local configuration columns: ID, jcm_chi_sim_rank, pval_jcm_obs_BB_sim, pval_jcm_obs_BW_sim, pval_jcm_obs_WW_sim

Arguments

fx

a factor with two or more categories, of the same length as the neighbours and weights objects in listw

listw

a listw object created for example by nb2listw

zero.policy

default attr(listw, "zero.policy") as set when listw was created, if attribute not set, use global option value; if TRUE assign zero to the lagged value of zones without neighbours, if FALSE assign NA

adjust.n

default TRUE, if FALSE the number of observations is not adjusted for no-neighbour observations, if TRUE, the number of observations is adjusted

nsim

default 0, number of conditonal permutation simulations

iseed

default NULL, used to set the seed; the output will only be reproducible if the count of CPU cores across which computation is distributed is the same

no_repeat_in_row

default FALSE, if TRUE, sample conditionally in each row without replacements to avoid duplicate values, https://github.com/r-spatial/spdep/issues/124

control

comp_binary=TRUE, binomial_punif_alternative="greater", jcm_same_punif_alternative="less", jcm_diff_punif_alternative="greater"

Author

Roger Bivand based on earlier code by Tomasz M. Kossowski, Justyna Wilk and Michał B. Pietrzak

Details

The original code may be found at tools:::Rd_expr_doi("10.5281/zenodo.4283766")

References

Cliff, A. D., Ord, J. K. 1981 Spatial processes, Pion, p. 20;

Upton, G., Fingleton, B. 1985 Spatial data analysis by example: point pattern and qualitative data, Wiley, pp. 158--170;

Boots, B., 2003. Developing local measures of spatial association for categorical data. Journal of Geographical Systems 5, 139–160;

Boots, B., 2006. Local configuration measures for categorical spatial data: binary regular lattices. Journal of Geographical Systems 8 (1), 1–24;

Pietrzak, M.B., Wilk, J., Kossowski, T., Bivand, R.S., 2014. The application of local indicators for categorical data (LICD) in the spatial analysis of economic development. Comparative Economic Research 17 (4), 203–220 tools:::Rd_expr_doi("10.2478/cer-2014-0041");

Bivand, R.S., Wilk, J., Kossowski, T., 2017. Spatial association of population pyramids across Europe: The application of symbolic data, cluster analysis and join-count tests. Spatial Statistics 21 (B), 339–361 tools:::Rd_expr_doi("10.1016/j.spasta.2017.03.003");

Francesco Carrer, Tomasz M. Kossowski, Justyna Wilk, Michał B. Pietrzak, Roger S. Bivand, The application of Local Indicators for Categorical Data (LICD) to explore spatial dependence in archaeological spaces, Journal of Archaeological Science, 126, 2021, tools:::Rd_expr_doi("10.1016/j.jas.2020.105306")

See Also

joincount.multi

Examples

columbus <- st_read(system.file("shapes/columbus.gpkg", package="spData")[1], quiet=TRUE)
HICRIME <- cut(columbus$CRIME, breaks=c(0,35,80), labels=c("low","high"))
(nb <- poly2nb(columbus))
lw <- nb2listw(nblag_cumul(nblag(nb, 2)), style="B")
obj <- licd_multi(HICRIME, lw)
str(obj)
h_obj <- hotspot(obj)
str(h_obj)
table(h_obj$both_recode)
columbus$both <- h_obj$both_recode
plot(columbus[, "both"])
GDAL37 <- as.numeric_version(unname(sf_extSoftVersion()["GDAL"])) >= "3.7.0"
file <- "etc/shapes/GB_2024_southcoast_50m.gpkg.zip"
zipfile <- system.file(file, package="spdep")
if (GDAL37) {
    sc50m <- st_read(zipfile)
} else {
    td <- tempdir()
    bn <- sub(".zip", "", basename(file), fixed=TRUE)
    target <- unzip(zipfile, files=bn, exdir=td)
    sc50m <- st_read(target)
}
sc50m$Winner <- factor(sc50m$Winner, levels=c("Con", "Green", "Lab", "LD"))
plot(sc50m[,"Winner"], pal=c("#2297E6", "#61D04F", "#DF536B", "#F5C710"))
nb_sc_50m <- poly2nb(sc50m, row.names=as.character(sc50m$Constituency))
sub2 <- attr(nb_sc_50m, "region.id")[attr(nb_sc_50m, "ncomp")$comp.id == 2L]
iowe <- match(sub2[1], attr(nb_sc_50m, "region.id"))
diowe <- c(st_distance(sc50m[iowe,], sc50m))
meet_criterion <- sum(diowe <= units::set_units(5000, "m"))
cands <- attr(nb_sc_50m, "region.id")[order(diowe)[1:meet_criterion]]
nb_sc_50m_iowe <- addlinks1(nb_sc_50m, from = cands[1],
 to = cands[3:meet_criterion])
ioww <- match(sub2[2], attr(nb_sc_50m, "region.id"))
dioww <- c(st_distance(sc50m[ioww,], sc50m))
meet_criterion <- sum(dioww <= units::set_units(5000, "m"))
cands <- attr(nb_sc_50m, "region.id")[order(dioww)[1:meet_criterion]]
nb_sc_50m_iow <- addlinks1(nb_sc_50m_iowe, from = cands[2], to = cands[3:meet_criterion])
nb_sc_1_2 <- nblag_cumul(nblag(nb_sc_50m_iow, 2))
lw <- nb2listw(nb_sc_1_2, style="B")
licd_obj <- licd_multi(sc50m$Winner, lw)
h_obj <- hotspot(licd_obj)
sc50m$both <- h_obj$both_recode
plot(sc50m[, "both"])
ljc <- local_joincount_uni(factor(sc50m$Winner == "LD"), chosen="TRUE", lw)
sc50m$LD_pv <- ljc[, 2]
plot(sc50m[, "LD_pv"], breaks=c(0, 0.025, 0.05, 0.1, 0.5, 1))