stkhat
From splancs v2.0140
by Roger Bivand
Compute the spacetime Kfunctions
 Keywords
 spatial
Usage
stkhat(pts, times, poly, tlimits, s, tm)
Arguments
 pts
 A set of points as defined in Splancs
 times

A vector of times, the same length as the number of points in
pts
 poly
 A polygon enclosing the points
 tlimits
 A vector of length 2 specifying the upper and lower temporal domain.
 s
 A vector of spatial distances for the analysis.
 tm
 A vector of times for the analysis
Value
A list with the following components is returned:
References
Diggle, P., Chetwynd, A., Haggkvist, R. and Morris, S. 1995 Secondorder analysis of spacetime clustering. Statistical Methods in Medical Research, 4, 124136;Bailey, T. C. and Gatrell, A. C. 1995, Interactive spatial data analysis. Longman, Harlow, pp. 122125; Rowlingson, B. and Diggle, P. 1993 Splancs: spatial point pattern analysis code in SPlus. Computers and Geosciences, 19, 627655; the original sources can be accessed at: http://www.maths.lancs.ac.uk/~rowlings/Splancs/. See also Bivand, R. and Gebhardt, A. 2000 Implementing functions for spatial statistical analysis using the R language. Journal of Geographical Systems, 2, 307317.
See Also
Examples
data(burkitt)
bur1 < stkhat(burpts, burkitt$t, burbdy, c(400, 5800),
seq(1,40,2), seq(100, 1500, 100))
oldpar < par(mfrow=c(2,1))
plot(bur1$s, bur1$ks, type="l", xlab="distance", ylab="Estimated K",
main="spatial K function")
plot(bur1$t, bur1$kt, type="l", xlab="time", ylab="Estimated K",
main="temporal K function")
par(oldpar)
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