spdep (version 0.3-8)

nc.sids: North Carolina SIDS data

Description

The nc.sids data frame has 100 rows and 9 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)

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; http://sal.agecon.uiuc.edu/datasets/sids.zip.

Examples

library(maptools)
data(nc.sids)
plot(sidspolys, border="grey", forcefill=FALSE)
plot(ncCR85.nb, sidscents, add=TRUE, col="blue")
plot(sidspolys, border="grey", forcefill=FALSE)
plot(ncCC89.nb, cbind(nc.sids$lon, nc.sids$lat),
 add=TRUE, col="blue")