nc.sids {spData} | R Documentation

## North Carolina SIDS data

### 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

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

### Examples

    if (requireNamespace("rgdal", quietly = TRUE)) {
      library(rgdal)
      if (requireNamespace("spdep", quietly = TRUE)) {
        library(spdep)
        nc.sids <- readOGR(system.file("shapes/sids.shp", package="spData")[1])
        proj4string(nc.sids) <- CRS("+proj=longlat +ellps=clrk66")
        row.names(nc.sids) <- as.character(nc.sids$FIPS)
        rn <- row.names(nc.sids)
        ncCC89_nb <- read.gal(system.file("weights/ncCC89.gal", package="spData")[1],
                              region.id=rn)
        ncCR85_nb <- read.gal(system.file("weights/ncCR85.gal", package="spData")[1],
                              region.id=rn)

        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")
      }
    }

[Package spData version 0.2.9.0 Index]