elliptic.zones: Determine zones for 'elliptic.test'

In smerc: Statistical Methods for Regional Counts

Determine zones for elliptic.test

Description

elliptic.zones constructs the elliptical zones for elliptic.test.

Usage

elliptic.zones(
  coords,
  pop,
  ubpop = 0.5,
  shape = c(1, 1.5, 2, 3, 4, 5),
  nangle = c(1, 4, 6, 9, 12, 15)
)

Arguments

coords	An n \times 2 matrix of centroid coordinates for the regions in the form (x, y) or (longitude, latitude) is using great circle distance.
pop	The population size associated with each region.
ubpop	The upperbound of the proportion of the total population to consider for a cluster.
shape	The ratios of the major and minor axes of the desired ellipses.
nangle	The number of angles (between 0 and 180) to consider for each shape.

Value

A list with all distinct zones, the associated shape parameters, and the associated angle parameters.

References

Kulldorff, M., Huang, L., Pickle, L. and Duczmal, L. (2006) An elliptic spatial scan statistic. Statististics in Medicine, 25:3929-3943. <doi:10.1002/sim.2490>

Examples

## Not run: 
data(nydf)
coords <- with(nydf, cbind(longitude, latitude))
out <- elliptic.zones(
  coords = coords, pop = nydf$pop,
  shape = 1.5, nangle = 4
)

## End(Not run)

smerc documentation built on Oct. 10, 2023, 5:07 p.m.