Bovine Tuberculosis Data
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).
data(btb)
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.
|
full |
A more extensive dataset
compiled from files supplied by Professor Diggle.
This is a marked point pattern, identical to standard
except that it includes 46 additional farm locations where
bovine tuberculosis was detected, but where the spoligotype
was not one of the four common spoligotypes. There are 919 data
points altogether.
The attribute attr(full, "retained") is a logical vector
indicating which of the points in full was retained
or deleted to obtain standard.
|
Professor Peter Diggle.
Roger Sainsbury of the UK's State Veterinary Service helped to collect the data-set. Jackie Inwald and Si Palmer of the Department of Bacterial Diseases, Veterinary Laboratories Agency, Weybridge, UK carried out the spoligotyping.
Peter Diggle supplied the point coordinates, spoligotype data
and year data, and the coordinates of the window used in
btb.extra.
Tilman Davies drew the finer window used in btb.
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.
if(require(spatstat.geom)) {
summary(btb)
plot(subset(btb, select=spoligotype), cols=2:5)
}Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.