# probmap

0th

Percentile

##### Probability mapping for rates

The function returns a data frame of rates for counts in populations at risk with crude rates, expected counts of cases, relative risks, and Poisson probabilities.

Keywords
spatial
##### Usage
probmap(n, x, row.names=NULL, alternative="less")
##### Arguments
n
a numeric vector of counts of cases
x
a numeric vector of populations at risk
row.names
row names passed through to output data frame
alternative
default “less”, may be set to “greater”
##### Details

The function returns a data frame, from which rates may be mapped after class intervals have been chosen. The class intervals used in the examples are mostly taken from the referenced source.

##### References

Bailey T, Gatrell A (1995) Interactive Spatial Data Analysis, Harlow: Longman, pp. 300--303.

EBest, EBlocal, ppois

• probmap
##### Examples
example(auckland)
res <- probmap(auckland$M77_85, 9*auckland$Und5_81)
rt <- sum(auckland$M77_85)/sum(9*auckland$Und5_81)
ppois_pmap <- numeric(length(auckland$Und5_81)) for (i in seq(along=ppois_pmap)) { ppois_pmap[i] <- poisson.test(auckland$M77_85[i], r=rt,
T=(9*auckland$Und5_81[i]), alternative="less")$p.value
}
all.equal(ppois_pmap, res$pmap) brks <- c(-Inf,2,2.5,3,3.5,Inf) cols <- grey(6:2/7) plot(auckland, col=cols[findInterval(res$raw*1000, brks, all.inside=TRUE)])
legend("bottomleft", fill=cols, legend=leglabs(brks), bty="n")
title(main="Crude (raw) estimates of infant mortality per 1000 per year")
brks <- c(-Inf,47,83,118,154,190,Inf)
cols <- cm.colors(6)
plot(auckland, col=cols[findInterval(res$relRisk, brks, all.inside=TRUE)]) legend("bottomleft", fill=cols, legend=leglabs(brks), bty="n") title(main="Standardised mortality ratios for Auckland child deaths") brks <- c(0,0.05,0.1,0.2,0.8,0.9,0.95,1) cols <- cm.colors(7) plot(auckland, col=cols[findInterval(res$pmap, brks, all.inside=TRUE)])
legend("bottomleft", fill=cols, legend=leglabs(brks), bty="n")
title(main="Poisson probabilities for Auckland child mortality")

Documentation reproduced from package spdep, version 0.6-9, License: GPL (>= 2)

### Community examples

Looks like there are no examples yet.