nc.sids: North Carolina SIDS data

In spdep: Spatial Dependence: Weighting Schemes, Statistics and Models

Description

(Use example(nc.sids) to read the data set from shapefile, together with import of two different list of neighbours).

The nc.sids data frame has 100 rows and 21 columns. It contains data given in Cressie (1991, pp. 386-9), Cressie and Read (1985) and Cressie and Chan (1989) on sudden infant deaths in North Carolina for 1974-78 and 1979-84. The data set also contains the neighbour list given by Cressie and Chan (1989) omitting self-neighbours (ncCC89.nb), and the neighbour list given by Cressie and Read (1985) for contiguities (ncCR85.nb). The data are ordered by county ID number, not alphabetically as in the source tables sidspolys is a "polylist" object of polygon boundaries, and sidscents is a matrix of their centroids.

Usage

data(nc.sids)

Format

This data frame contains the following columns:

SP\_ID

SpatialPolygons ID

CNTY\_ID

county ID

east

eastings, county seat, miles, local projection

north

northings, county seat, miles, local projection

L\_id

Cressie and Read (1985) L index

M\_id

Cressie and Read (1985) M index

names

County names

AREA

County polygon areas in degree units

PERIMETER

County polygon perimeters in degree units

CNTY\_

Internal county ID

NAME

County names

FIPS

County ID

FIPSNO

County ID

CRESS\_ID

Cressie papers ID

BIR74

births, 1974-78

SID74

SID deaths, 1974-78

NWBIR74

non-white births, 1974-78

BIR79

births, 1979-84

SID79

SID deaths, 1979-84

NWBIR79

non-white births, 1979-84

Source

Cressie, N (1991), Statistics for spatial data. New York: Wiley, pp. 386–389; Cressie, N, Chan NH (1989) Spatial modelling of regional variables. Journal of the American Statistical Association, 84, 393–401; Cressie, N, Read, TRC (1985) Do sudden infant deaths come in clusters? Statistics and Decisions Supplement Issue 2, 333–349; https://spatial.uchicago.edu/sample-data.

Examples

require(maptools)
nc.sids <- readShapePoly(system.file("etc/shapes/sids.shp", package="spdep")[1],
  ID="FIPSNO", proj4string=CRS("+proj=longlat +ellps=clrk66"))
rn <- sapply(slot(nc.sids, "polygons"), function(x) slot(x, "ID"))
ncCC89_nb <- read.gal(system.file("etc/weights/ncCC89.gal", package="spdep")[1],
  region.id=rn)
ncCR85_nb <- read.gal(system.file("etc/weights/ncCR85.gal", package="spdep")[1],
  region.id=rn)
## Not run: 
plot(nc.sids, border="grey")
plot(ncCR85_nb, coordinates(nc.sids), add=TRUE, col="blue")
plot(nc.sids, border="grey")
plot(ncCC89_nb, coordinates(nc.sids), add=TRUE, col="blue")

## End(Not run)

Example output

Loading required package: sp
Loading required package: Matrix
Loading required package: maptools
Checking rgeos availability: TRUE
NOTE: rgdal::checkCRSArgs: no proj_defs.dat in PROJ.4 shared files
Warning message:
use rgdal::readOGR or sf::st_read 

spdep documentation built on Aug. 19, 2017, 3:01 a.m.