spatstat.data (version 2.1-0)

btb: Bovine Tuberculosis Data

Description

Geospatial data of 873 farm locations with detected bovine tuberculosis in Cornwall, UK, over the years 1989-2002. This data-set was first analysed in Diggle, Zheng and Durr (2005).

Usage

data(btb)

Format

Loading this dataset supplies the point pattern btb and the additional object btb.extra.

btb is a marked point pattern (see ppp.object) containing 873 points. Its spatial coordinates are Eastings and Northings in kilometres giving the farm locations. It has two columns of marks:

year	Year of detection: a factor with levels 1989 to 2002
spoligotype	Spoligotype of tuberculosis: a factor with four levels “9”, “12”, “15”, “20”

Loading the dataset btb will also load the object btb.extra containing additional data. This is a list (of class "solist") containing two elements,

standard

The standard version of the BTB dataset used in many publications. This is a marked point pattern, identical to btb except that its window of observation is a slightly larger and simpler polygon than the window of btb.

References

Diggle, P.J., Zheng, P. and Durr, P. (2005) Nonparametric estimation of spatial segregation in a multivariate point process: bovine tuberculosis in Cornwall, UK. Applied Statistics, 54, 645--658.

Examples

# NOT RUN {
  if(require(spatstat.geom)) {
    summary(btb)
    plot(subset(btb, select=spoligotype), cols=2:5)
  }
# }