| neast {smerc} | R Documentation |
Breast cancer mortality in the Northeastern United States
Description
An sf object containing data related to
breast cancer mortality in the Northeastern United
States. The data include several variables observed for
245 counties (or similar) as well polygon information defined using
longitude/latitude coordinates in the WGS84 coordinate
system. The following variables are included in the
object:
-
id: A name-based id for each county. -
cases: The number of breast cancer mortality cases between 1988-1992. -
population: The number of residents in the county based on 1990 U.S. census results. -
x: An x coordinate of a centroid associated with each county provided by Kulldorff et al. (2003). See Details. -
y: A y coordinate of a centroid associated with each county provided by Kulldorff et al. (2003). See Details.
Details
The x and y coordinates define centroids
associated with each county. The coordinates were
provided by Kulldorf et al. (2003). They are appropriate
for computing standard Euclidean intercentroid distance
between counties but are not consistent with the polygon
geometry of the data set. The coordinate system
of these coordinates is unknown.
Alternative centroids for the geometry can be obtained using the following commands.
sf::sf_use_s2(FALSE)
pts <- sf::st_centroid(sf::st_geometry(neast))
References
Martin Kulldorff, Eric J. Feuer, Barry A. Miller, Laurence S. Freedman; Breast Cancer Clusters in the Northeast United States: A Geographic Analysis, American Journal of Epidemiology, Volume 146, Issue 2, 15 July 1997, Pages 161–170. doi:10.1093/oxfordjournals.aje.a009247.
Examples
if (require(sf)) {
data(neast)
plot(st_geometry(neast))
plot(neast["cases"])
}