nc.sids {spdep} | R Documentation |
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.
data(nc.sids)
This data frame contains the following columns:
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.
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")