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Compute Local Geary statistic

localC.Rd

The Local Geary is a local adaptation of Geary's C statistic of spatial autocorrelation. The Local Geary uses squared differences to measure dissimilarity unlike the Local Moran. Low values of the Local Geary indicate positive spatial autocorrelation and large refers to negative spatial autocorrelation.

Inference for the Local Geary is based on a permutation approach which compares the observed value to the reference distribution under spatial randomness. localC_perm() returns a pseudo p-value. This is not an analytical p-value and is based on the number of permutations and as such should be used with care.

Usage

localC(x, ..., zero.policy=NULL)

# Default S3 method
localC(x, listw, ..., zero.policy=attr(listw, "zero.policy"))

# S3 method for class 'formula'
localC(formula, data, listw, ..., zero.policy=attr(listw, "zero.policy"))

# S3 method for class 'list'
localC(x, listw, ..., zero.policy=attr(listw, "zero.policy"))

# S3 method for class 'matrix'
localC(x, listw, ..., zero.policy=attr(listw, "zero.policy"))

# S3 method for class 'data.frame'
localC(x, listw, ..., zero.policy=attr(listw, "zero.policy"))

localC_perm(x, ..., zero.policy=NULL, iseed=NULL, no_repeat_in_row=FALSE)

# Default S3 method
localC_perm(x, listw, nsim = 499, alternative = "two.sided", ...,
 zero.policy=attr(listw, "zero.policy"), iseed=NULL, no_repeat_in_row=FALSE)

# S3 method for class 'formula'
localC_perm(formula, data, listw, nsim = 499,
 alternative = "two.sided", ..., zero.policy=attr(listw, "zero.policy"), iseed=NULL,
 no_repeat_in_row=FALSE)

Arguments

x

a numeric vector, numeric matrix, or list. See details for more.

formula

A one-sided formula determining which variables to be used.

listw

a listw object created for example by nb2listw.

data

Used when a formula is provided. A matrix or data frame containing the variables in the formula formula.

nsim

The number of simulations to be used for permutation test.

alternative

A character defining the alternative hypothesis. Must be one of "two.sided", "less" or "greater".

...

other arguments passed to methods.

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.

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

Details

The Local Geary can be extended to a multivariate context. When x is a numeric vector, the univariate Local Geary will be calculated. To calculate the multivariate Local Moran provide either a list or a matrix. When x is a list, each element must be a numeric vector of the same length and of the same length as the neighbours in listw. In the case that x is a matrix the number of rows must be the same as the length of the neighbours in listw.

While not required in the univariate context, the standardized Local Geary is calculated. The multivariate Local Geary is always standardized.

The univariate Local Geary is calculated as \(c_i = \sum_j w_{ij}(x_i - x_j)^2\) and the multivariate Local Geary is calculated as \(c_{k,i} = \sum_{v=1}^{k} c_{v,i}\) as described in Anselin (2019).

Value

A numeric vector containing Local Geary statistic with attribute pseudo-p when localC_perm() is used. pseudo-p is an 8 column matrix containing

E.Ci

expectation of the Local Geary statistic based on permutation sample

Var.Ci

variance of Local Geary based on permutation sample

Z.Ci

standard deviate of Local Geary based on permutation sample

Pr()

p-value of Local Geary statistic using pnorm() using standard deviates based on permutation sample means and standard deviations

Pr() Sim

rank() and punif() of observed statistic rank for [0, 1] p-values using alternative=

Pr(folded) Sim

the simulation folded [0, 0.5] range ranked p-value (based on https://github.com/pysal/esda/blob/4a63e0b5df1e754b17b5f1205b8cadcbecc5e061/esda/crand.py#L211-L213)

Skewness

the output of e1071::skewness() for the permutation samples underlying the standard deviates

Kurtosis

the output of e1071::kurtosis() for the permutation samples underlying the standard deviates

References

Anselin, L. (1995), Local Indicators of Spatial Association—LISA. Geographical Analysis, 27: 93-115. doi:10.1111/j.1538-4632.1995.tb00338.x

Anselin, L. (2019), A Local Indicator of Multivariate Spatial Association: Extending Gearys c. Geogr Anal, 51: 133-150. doi:10.1111/gean.12164

Author

Josiah Parry josiah.parry@gmail.com and Roger Bivand

Examples

orig <- spData::africa.rook.nb
listw <- nb2listw(orig)
x <- spData::afcon$totcon

(A <- localC(x, listw))
#>  [1] 0.39025457 0.50460439 0.15303047 2.90814878 3.40006901 0.17103368
#>  [7] 0.29947832 0.72444806 2.30617282 5.70252541 2.23161263 0.17833029
#> [13] 0.18420002 0.18680408 0.37851643 0.11056720 0.14814835 0.17257920
#> [19] 0.03254150 0.18992772 0.08749322 3.71970760 0.09566918 0.26112918
#> [25] 0.09505331 2.99934478 1.17465032 1.64868780 0.87901004 0.05909537
#> [31] 2.54591475 3.85570655 2.99413462 0.96084992 0.80678832 1.56869350
#> [37] 0.86422915 0.38817470 0.23425755 1.26191610 1.34455327 1.80707481
listw1 <- nb2listw(droplinks(sym.attr.nb(orig), 3, sym=TRUE), zero.policy=TRUE)
#> Warning: some observations have no neighbours
#> Warning: neighbour object has 2 sub-graphs
(A1 <- localC(x, listw1, zero.policy=FALSE))
#>  [1] 0.39025457 0.57491918         NA 2.90814878 3.40006901 0.17103368
#>  [7] 0.29947832 0.72444806 2.30617282 5.70252541 2.23161263 0.17833029
#> [13] 0.18420002 0.18680408 0.37851643 0.11056720 0.14814835 0.17257920
#> [19] 0.03254150 0.18992772 0.08749322 3.71970760 0.09566918 0.26112918
#> [25] 0.09505331 2.99934478 1.17465032 1.64868780 0.87901004 0.05909537
#> [31] 2.54591475 3.85570655 2.99413462 0.96084992 0.80678832 1.56869350
#> [37] 0.86422915 0.38817470 0.23425755 1.26191610 1.34455327 1.80707481
(A2 <- localC(x, listw1, zero.policy=TRUE))
#>  [1] 0.39025457 0.57491918 0.00000000 2.90814878 3.40006901 0.17103368
#>  [7] 0.29947832 0.72444806 2.30617282 5.70252541 2.23161263 0.17833029
#> [13] 0.18420002 0.18680408 0.37851643 0.11056720 0.14814835 0.17257920
#> [19] 0.03254150 0.18992772 0.08749322 3.71970760 0.09566918 0.26112918
#> [25] 0.09505331 2.99934478 1.17465032 1.64868780 0.87901004 0.05909537
#> [31] 2.54591475 3.85570655 2.99413462 0.96084992 0.80678832 1.56869350
#> [37] 0.86422915 0.38817470 0.23425755 1.26191610 1.34455327 1.80707481
run <- FALSE
if (require(rgeoda, quietly=TRUE)) run <- TRUE
#> 
#> Attaching package: ‘rgeoda’
#> The following object is masked from ‘package:spdep’:
#> 
#>     skater
if (run) {
  W <- create_weights(as.numeric(length(x)))
  for (i in 1:length(listw$neighbours)) {
    set_neighbors_with_weights(W, i, listw$neighbours[[i]], listw$weights[[i]])
    update_weights(W)
  }
  set.seed(1)
  B <- local_geary(W, data.frame(x))
  all.equal(A, lisa_values(B))
}
#> [1] TRUE
if (run) {
  set.seed(1)
  C <- localC_perm(x, listw, nsim = 499, conditional=TRUE,
    alternative="two.sided")
  cor(ifelse(lisa_pvalues(B) < 0.5, lisa_pvalues(B), 1-lisa_pvalues(B)),
    attr(C, "pseudo-p")[,6])
}
#> [1] 0.985611
# pseudo-p values probably wrongly folded https://github.com/GeoDaCenter/rgeoda/issues/28
# \donttest{
tmap_ok <- FALSE
if (require(tmap, quietly=TRUE)) tmap_ok <- TRUE
#> Breaking News: tmap 3.x is retiring. Please test v4, e.g. with
#> remotes::install_github('r-tmap/tmap')
if (run) {
  # doi: 10.1111/gean.12164
  guerry_path <- system.file("extdata", "Guerry.shp", package = "rgeoda")
  g <- st_read(guerry_path)[, 7:12]
  cor(st_drop_geometry(g)) #(Tab. 1)
  lw <- nb2listw(poly2nb(g))
  moran(g$Crm_prs, lw, n=nrow(g), S0=Szero(lw))$I
  moran(g$Crm_prp, lw, n=nrow(g), S0=Szero(lw))$I
  moran(g$Litercy, lw, n=nrow(g), S0=Szero(lw))$I
  moran(g$Donatns, lw, n=nrow(g), S0=Szero(lw))$I
  moran(g$Infants, lw, n=nrow(g), S0=Szero(lw))$I
  moran(g$Suicids, lw, n=nrow(g), S0=Szero(lw))$I
}
#> Reading layer `Guerry' from data source 
#>   `/home/rsb/lib/r_libs/rgeoda/extdata/Guerry.shp' using driver `ESRI Shapefile'
#> Simple feature collection with 85 features and 29 fields
#> Geometry type: MULTIPOLYGON
#> Dimension:     XY
#> Bounding box:  xmin: 47680 ymin: 1703258 xmax: 1031401 ymax: 2677441
#> Projected CRS: NTF (Paris) / Lambert zone II
#> [1] 0.4016812
if (run) {
  o <- prcomp(st_drop_geometry(g), scale.=TRUE)
  cor(st_drop_geometry(g), o$x[,1:2])^2 #(Tab. 2)
}
#>                 PC1         PC2
#> Crm_prs 0.009286863 0.418851254
#> Crm_prp 0.561825664 0.009377232
#> Litercy 0.560570048 0.020095011
#> Donatns 0.024138865 0.586720363
#> Infants 0.436025658 0.012817054
#> Suicids 0.548623327 0.152958961
if (run) {
  g$PC1 <- o$x[, "PC1"]
  brks <- c(min(g$PC1), natural_breaks(k=6, g["PC1"]), max(g$PC1))
  if (tmap_ok) {
    tmap4 <- packageVersion("tmap") >= "3.99"
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="PC1", 
        fill.scale=tm_scale(values="brewer.rd_yl_gn", breaks=brks,
        midpoint=0), fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
        frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("PC1", breaks=brks, midpoint=0) + 
      tm_borders() # Fig. 1
    }
  } else {
    pplot(g["PC1"], breaks=brks)
  }
}

if (run) {
  g$PC2 <- -1*o$x[, "PC2"] # eigenvalue sign arbitrary
  brks <- c(min(g$PC2), natural_breaks(k=6, g["PC2"]), max(g$PC2))
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="PC2", 
        fill.scale=tm_scale(values="brewer.rd_yl_gn", breaks=brks,
        midpoint=0), fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
        frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("PC2", breaks=brks, midpoint=0) + 
      tm_borders() # Fig. 2
    }
  } else {
    plot(g["PC2"], breaks=brks)
  }
}

if (run) {
  w <- queen_weights(g)
  lm_PC1 <- local_moran(w, g["PC1"], significance_cutoff=0.01,
    permutations=99999)
  g$lm_PC1 <- factor(lisa_clusters(lm_PC1), levels=0:4,
    labels=lisa_labels(lm_PC1)[1:5])
  is.na(g$lm_PC1) <- g$lm_PC1 == "Not significant"
  g$lm_PC1 <- droplevels(g$lm_PC1)
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lm_PC1",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lm_PC1", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # Fig. 3
    }
  } else {
    plot(g["lm_PC1"])
  }
}

if (run) {
  set.seed(1)
  lm_PC1_spdep <- localmoran_perm(g$PC1, lw, nsim=9999)
  q <- attr(lm_PC1_spdep, "quadr")$pysal
  g$lm_PC1_spdep <- q
  is.na(g$lm_PC1_spdep) <- lm_PC1_spdep[,6] > 0.02 # note folded p-values
  g$lm_PC1_spdep <- droplevels(g$lm_PC1_spdep)
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lm_PC1_spdep",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lm_PC1_spdep", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # rep. Fig. 3
    }
  } else {
    plot(g["lm_PC1_spdep"])
  }
}

if (run) {
  lg_PC1 <- local_g(w, g["PC1"], significance_cutoff=0.01,
    permutations=99999)
  g$lg_PC1 <- factor(lisa_clusters(lg_PC1), levels=0:2,
    labels=lisa_labels(lg_PC1)[0:3])
  is.na(g$lg_PC1) <- g$lg_PC1 == "Not significant"
  g$lg_PC1 <- droplevels(g$lg_PC1)
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lg_PC1",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lg_PC1", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # Fig. 4 (wrong)
    }
  } else {
    plot(g["lg_PC1"])
  }
  g$lg_PC1a <- cut(g$PC1, c(-Inf, mean(g$PC1), Inf), labels=c("Low", "High"))
  is.na(g$lg_PC1a) <- lisa_pvalues(lg_PC1) >= 0.01
  g$lg_PC1a <- droplevels(g$lg_PC1a)
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lg_PC1a",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lg_PC1a", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # Fig. 4 (guess)
    }
  } else {
    plot(g["lg_PC1"])
  }
}

if (run) {
  lc_PC1 <- local_geary(w, g["PC1"], significance_cutoff=0.01,
    permutations=99999)
  g$lc_PC1 <- factor(lisa_clusters(lc_PC1), levels=0:4,
    labels=lisa_labels(lc_PC1)[1:5])
  is.na(g$lc_PC1) <- g$lc_PC1 == "Not significant"
  g$lc_PC1 <- droplevels(g$lc_PC1)
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lc_PC1",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lc_PC1", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # Fig. 5
    }
  } else {
    plot(g["lc_PC1"])
  }
}

if (run) {
  set.seed(1)
  system.time(lc_PC1_spdep <- localC_perm(g$PC1, lw, nsim=9999,
    alternative="two.sided"))
}
#>    user  system elapsed 
#>   0.340   0.001   0.343 
if (run) {
  if (require(parallel, quietly=TRUE)) {
    ncpus <- max(2L, detectCores(logical=FALSE), na.rm = TRUE)-1L
# test with single core
    if (ncpus > 1L) ncpus <- 1L
    cores <- get.coresOption()
    set.coresOption(ncpus)
    system.time(lmc_PC1_spdep1 <- localC_perm(g$PC1, lw, nsim=9999,
      alternative="two.sided", iseed=1))
    set.coresOption(cores)
  }
}
#> [1] 1
if (run) {
  g$lc_PC1_spdep <- attr(lc_PC1_spdep, "cluster")
  is.na(g$lc_PC1_spdep) <- attr(lc_PC1_spdep, "pseudo-p")[,6] > 0.01
  g$lc_PC1_spdep <- droplevels(g$lc_PC1_spdep)
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lc_PC1_spdep",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lc_PC1_spdep", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # rep. Fig. 5
    }
  } else {
    plot(g["lc_PC1_spdep"])
  }
}

if (run) {
  g$both_PC1 <- interaction(g$lc_PC1, g$lm_PC1)
  g$both_PC1 <- droplevels(g$both_PC1)
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="both_PC1",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("both_PC1", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # Fig. 6
    }
  } else {
    plot(g["both_PC1"])
  }
}

if (run) {
  lc005_PC1 <- local_geary(w, g["PC1"], significance_cutoff=0.005,
    permutations=99999)
  g$lc005_PC1 <- factor(lisa_clusters(lc005_PC1), levels=0:4,
    labels=lisa_labels(lc005_PC1)[1:5])
  is.na(g$lc005_PC1) <- g$lc005_PC1 == "Not significant"
  g$lc005_PC1 <- droplevels(g$lc005_PC1)
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lc005_PC1",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lc005_PC1", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # Fig. 7
    }
  } else {
    plot(g["lc005_PC1"])
}
if (run) {
  g$lc005_PC1_spdep <- attr(lc_PC1_spdep, "cluster")
  is.na(g$lc005_PC1_spdep) <- attr(lc_PC1_spdep, "pseudo-p")[,6] > 0.005
  g$lc005_PC1_spdep <- droplevels(g$lc005_PC1_spdep)
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lc005_PC1_spdep",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lc005_PC1_spdep", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # rep. Fig. 7
    }
  } else {
    plot(g["lc005_PC1_spdep"])
  }
}
if (run) {
  lc001_PC1 <- local_geary(w, g["PC1"], significance_cutoff=0.001,
    permutations=99999)
  g$lc001_PC1 <- factor(lisa_clusters(lc001_PC1), levels=0:4,
    labels=lisa_labels(lc001_PC1)[1:5])
  is.na(g$lc001_PC1) <- g$lc001_PC1 == "Not significant"
  g$lc001_PC1 <- droplevels(g$lc001_PC1)
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lc005_PC1",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lc001_PC1", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # Fig. 8
    }
  } else {
    plot(g["lc001_PC1"])
  }
}
if (run) {
  g$lc001_PC1_spdep <- attr(lc_PC1_spdep, "cluster")
  is.na(g$lc001_PC1_spdep) <- attr(lc_PC1_spdep, "pseudo-p")[,6] > 0.001
  g$lc001_PC1_spdep <- droplevels(g$lc001_PC1_spdep)
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lc005_PC1_spdep",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lc001_PC1_spdep", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # rep. Fig. 8
    }
  } else {
    plot(g["lc001_PC1_spdep"])
  }
}
}

if (run) {
  lc_PC2 <- local_geary(w, g["PC2"], significance_cutoff=0.01,
    permutations=99999)
  g$lc_PC2 <- factor(lisa_clusters(lc_PC2), levels=0:4,
    labels=lisa_labels(lc_PC2)[1:5])
  is.na(g$lc_PC2) <- g$lc_PC2 == "Not significant"
  g$lc_PC2 <- droplevels(g$lc_PC2)
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lc_PC2",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lc_PC2", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # Fig. 9
    }
  } else {
    plot(g["lc_PC2"])
  }
}

if (run) {
  lmc_PC <- local_multigeary(w, g[c("PC1","PC2")], significance_cutoff=0.00247,
    permutations=99999)
  g$lmc_PC <- factor(lisa_clusters(lmc_PC), levels=0:1,
    labels=lisa_labels(lmc_PC)[1:2])
  is.na(g$lmc_PC) <- g$lmc_PC == "Not significant"
  g$lmc_PC <- droplevels(g$lmc_PC)
  table(interaction((p.adjust(lisa_pvalues(lmc_PC), "fdr") < 0.01), g$lmc_PC))
}
#> 
#> FALSE.Positive  TRUE.Positive 
#>              0             21 
if (run) {
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lmc_PC",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lmc_PC", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # Fig. 10
    }
  } else {
    plot(g["lmc_PC"])
  }
}

if (run) {
  set.seed(1)
  lmc_PC_spdep <- localC_perm(g[c("PC1","PC2")], lw, nsim=9999, alternative="two.sided")
  all.equal(lisa_values(lmc_PC), c(lmc_PC_spdep))
}
#> [1] TRUE
if (run) {
  cor(attr(lmc_PC_spdep, "pseudo-p")[,6], lisa_pvalues(lmc_PC))
}
#> [1] 0.9905202
if (run) {
  g$lmc_PC_spdep <- attr(lmc_PC_spdep, "cluster")
  is.na(g$lmc_PC_spdep) <- p.adjust(attr(lmc_PC_spdep, "pseudo-p")[,6], "fdr") > 0.01
  g$lmc_PC_spdep <- droplevels(g$lmc_PC_spdep)
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lmc_PC_spdep",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lmc_PC_spdep", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # rep. Fig. 10
    }
  } else {
    plot(g["lmc_PC_spdep"])
  }
}

if (run) {
  lmc_vars <- local_multigeary(w, st_drop_geometry(g)[, 1:6],
    significance_cutoff=0.00247, permutations=99999)
  g$lmc_vars <- factor(lisa_clusters(lmc_vars), levels=0:1,
    labels=lisa_labels(lmc_vars)[1:2])
  is.na(g$lmc_vars) <- g$lmc_vars == "Not significant"
  g$lmc_vars <- droplevels(g$lmc_vars)
  table(interaction((p.adjust(lisa_pvalues(lmc_vars), "fdr") < 0.01),
    g$lmc_vars))
}
#> 
#> FALSE.Positive  TRUE.Positive 
#>              0             21 
if (run) {
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lmc_vars",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lmc_vars", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # Fig. 11
    }
  } else {
    plot(g["lmc_vars"])
  }
}

if (run) {
  set.seed(1)
  system.time(lmc_vars_spdep <- localC_perm(st_drop_geometry(g)[, 1:6], lw,
    nsim=9999, alternative="two.sided"))
}
#>    user  system elapsed 
#>   0.559   0.014   0.575 
if (run) {
  all.equal(lisa_values(lmc_vars), c(lmc_vars_spdep))
}
#> [1] TRUE
if (run) {
  cor(attr(lmc_vars_spdep, "pseudo-p")[,6], lisa_pvalues(lmc_vars))
}
#> [1] 0.9938141
if (run) {
  if (require(parallel, quietly=TRUE)) {
    ncpus <- max(2L, detectCores(logical=FALSE), na.rm = TRUE)-1L
# test with single core
    if (ncpus > 1L) ncpus <- 1L
    cores <- get.coresOption()
    set.coresOption(ncpus)
    system.time(lmc_vars_spdep1 <- localC_perm(st_drop_geometry(g)[, 1:6], lw,
      nsim=9999, alternative="two.sided", iseed=1))
    set.coresOption(cores)
  }
}
#> [1] 1
if (run) {
  all.equal(lisa_values(lmc_vars), c(lmc_vars_spdep1))
}
#> [1] TRUE
if (run) {
  cor(attr(lmc_vars_spdep1, "pseudo-p")[,6], lisa_pvalues(lmc_vars))
}
#> [1] 0.9938141
if (run) {
  g$lmc_vars_spdep <- attr(lmc_vars_spdep1, "cluster")
  is.na(g$lmc_vars_spdep) <- p.adjust(attr(lmc_vars_spdep1, "pseudo-p")[,6], "fdr") > 0.01
  g$lmc_vars_spdep <- droplevels(g$lmc_vars_spdep)
  if (tmap_ok) {
    if (tmap4) {
      tm_shape(g) + tm_polygons(fill="lmc_vars_spdep",
        fill.scale=tm_scale(values="brewer.set3", value.na="gray95",
          label.na="Insignificant"),
        fill.legend=tm_legend(position=tm_pos_in("left", "bottom"),
          frame=FALSE, item.r=0))
    } else {
      tm_shape(g) + tm_fill("lmc_vars_spdep", textNA="Insignificant",
        colorNA="gray95") + tm_borders() # rep. Fig. 11
    }
  } else {
    plot(g["lmc_vars_spdep"])
  }
}


# }
# \dontrun{
library(reticulate)
use_python("/usr/bin/python", required = TRUE)
gp <- import("geopandas")
#> Error in py_module_import(module, convert = convert): ModuleNotFoundError: No module named 'geopandas'
#> Run `reticulate::py_last_error()` for details.
ps <- import("libpysal")
#> Error in py_module_import(module, convert = convert): ModuleNotFoundError: No module named 'libpysal'
#> Run `reticulate::py_last_error()` for details.
W <- listw2mat(listw)
w <- ps$weights$full2W(W, rownames(W))
#> Error: object 'ps' not found
w$transform <- "R"
#> Error in envRefSetField(x, what, refObjectClass(x), selfEnv, value): ‘transform’ is not a field in class “Weight”
esda <- import("esda")
#> Error in py_module_import(module, convert = convert): ModuleNotFoundError: No module named 'esda'
#> Run `reticulate::py_last_error()` for details.
lM <- esda$Moran_Local(x, w)
#> Error: object 'esda' not found
all.equal(unname(localmoran(x, listw, mlvar=FALSE)[,1]), c(lM$Is))
#> Error in h(simpleError(msg, call)): error in evaluating the argument 'current' in selecting a method for function 'all.equal': object 'lM' not found
# confirm x and w the same
lC <- esda$Geary_Local(connectivity=w)$fit(scale(x))
#> Error: object 'esda' not found
# np$std missing ddof=1
n <- length(x)
D0 <- spdep:::geary.intern((x - mean(x)) / sqrt(var(x)*(n-1)/n), listw, n=n)
# lC components probably wrongly ordered https://github.com/pysal/esda/issues/192
o <- match(round(D0, 6), round(lC$localG, 6))
#> Error: object 'lC' not found
all.equal(c(lC$localG)[o], D0)
#> Error in h(simpleError(msg, call)): error in evaluating the argument 'target' in selecting a method for function 'all.equal': object 'lC' not found
# simulation order not retained
lC$p_sim[o]
#> Error: object 'lC' not found
attr(C, "pseudo-p")[,6]
#>  [1] 0.408 0.374 0.144 0.056 0.010 0.284 0.032 0.264 0.186 0.004 0.150 0.224
#> [13] 0.022 0.150 0.438 0.084 0.126 0.184 0.002 0.238 0.126 0.100 0.068 0.372
#> [25] 0.124 0.234 0.230 0.016 0.318 0.176 0.272 0.164 0.164 0.206 0.402 0.250
#> [37] 0.410 0.402 0.328 0.294 0.438 0.248
# }