weeds.covariates {DSpat} | R Documentation |
Grid (1 sq meter) of covariates for farm paddock in Dubbo weed data.
data(weeds.covariates)
A data frame with 120 x 120 observations on the following 4 variables.
x
y
sheep
strip
This is the constructed set of covariates for the farm paddock for the weeds
data that were provided by Melville and Welsh (see reference below) that
were used in the Biometrics paper on distance sampling.
The code used to create the covariate grid was as follows:
xx=expand.grid(seq(5,1195,10),seq(5,1195,10)) weeds.covariates=data.frame(x=xx$Var2,y=xx$Var1, sheep=rep(c(0,1),each= 120^2/2), strip=rep(c(1,2,3,4,5,6,7,8),each=120^2/8)) save(weeds.covariates,file="weeds.covariates.rda")
Melville, G. J., and A. H. Welsh. 2001. Line transect sampling in small regions. Biometrics 57:1130-1137.