spData (version 2.3.3)

nydata: New York leukemia data

Description

New York leukemia data taken from the data sets supporting Waller and Gotway 2004 (the data should be loaded by running example(NY_data) to demonstrate spatial data import techniques)

Usage

nydata

Format

A data frame with 281 observations on the following 12 variables, and the binary coded spatial weights used in the source.

• AREANAME: name of census tract

• AREAKEY: unique FIPS code for each tract

• X: x-coordinate of tract centroid (in km)

• Y: y-coordinate of tract centroid (in km)

• POP8: population size (1980 U.S. Census)

• TRACTCAS: number of cases 1978-1982

• PROPCAS: proportion of cases per tract

• PCTOWNHOME: percentage of people in each tract owning their own home

• PCTAGE65P: percentage of people in each tract aged 65 or more

• Z: ransformed propoprtions

• AVGIDIST: average distance between centroid and TCE sites

• PEXPOSURE: "exposure potential": inverse distance between each census tract centroid and the nearest TCE site, IDIST, transformed via log(100*IDIST)

• Cases: as TRACTCAS with more digits

• Xm: X in metres

• Ym: Y in metres

• Xshift: feature offset

• Yshift: feature offset

Details

The examples section shows how the DBF files from the book website for Chapter 9 were converted into the nydata data frame and the listw_NY spatial weights list. The shapes directory includes the original version of the UTM18 census tract boundaries imported from BNA format (http://sedac.ciesin.columbia.edu/ftpsite/pub/census/usa/tiger/ny/bna_st/t8_36.zip) before the OGR/GDAL BNA driver was available. The NY8_utm18 shapefile was constructed using a bna2mif converter and converted to shapefile format after adding data using writeOGR. The new file NY8_bna_utm18.gpkg has been constructed from the original BNA file, but read using the OGR BNA driver with GEOS support. The NY8 shapefile and GeoPackage NY8_utm18.gpkg include invalid polygons, but because the OGR BNA driver may have GEOS support (used here), the tract polygon objects in NY8_bna_utm18.gpkg are valid.

References

Waller, L. and C. Gotway (2004) Applied Spatial Statistics for Public Health Data. New York: John Wiley and Sons.

Examples

## NY leukemia
# \donttest{
if (requireNamespace("sf", quietly = TRUE)) {
library(foreign)
nydata <- read.dbf(system.file("misc/nydata.dbf", package="spData")[1])
nydata <- sf::st_as_sf(nydata, coords=c("X", "Y"), remove=FALSE)
plot(sf::st_geometry(nydata))

nyadjmat <- as.matrix(read.dbf(system.file("misc/nyadjwts.dbf",
                                           package="spData")[1])[-1])
ID <- as.character(names(read.dbf(system.file("misc/nyadjwts.dbf",
                                              package="spData")[1]))[-1])
identical(substring(ID, 2, 10), substring(as.character(nydata$AREAKEY), 2, 10))

if (requireNamespace("sf", quietly = TRUE)) {
library(spdep)
listw_NY <- mat2listw(nyadjmat, as.character(nydata$AREAKEY), style="B")
}
}
# }