pick.cases: Select cases within certain distance around a site

In rSPARCS: Sites, Population, and Records Cleaning Skills

Select cases within certain distance around a site

Description

Identify the closest site (e.g. monitoring sites) for each case, and select cases within certain distance around a site, e.g. 15 miles buffer.

Usage

pick.cases(data,long.case,lat.case,long.sites,lat.sites,radius)

Arguments

data	a data.frame containing the coordinates of cases.
long.case	the name of variable in the data indicating the longitude of cases.
lat.case	the name of variable in the data indicating the latitude of cases.
long.sites	a numeric vector containing the longitude of sites.
lat.sites	a numeric vector containing the latitude of sites.
radius	radius of the buffer, e.g."15 miles", "20 kms".

Details

Not limited to hospital data, but also applicable to other surveillance data.

Value

which.site	the closest site to the case.
minDIST	the distance of the case to the closest site; in the same unit as "radius".
Select	an indicator of whether a case was within the buffer.

References

Zhang W, Lin S, Hopke PK, et al. Triggering of cardiovascular hospital admissions by fine particle concentrations in New York state: Before, during, and after implementation of multiple environmental policies and a recession. Environ. Pollut. [electronic article]. 2018;242:1404–1416.

Examples

set.seed(2018)
data=data.frame(Patient=1:100,lat=rnorm(100,41,0.5),long=rnorm(100,-76,1))

long.monitor=c(-73.75464,-78.80953,-73.902,-73.82153,-77.54817)
lat.monitor=c(42.64225,42.87691,40.81618,40.73614,43.14618)

data.out=pick.cases(data,long.case="long",lat.case="lat",
long.sites=long.monitor,lat.sites=lat.monitor,radius="30 miles")
data.out

rSPARCS documentation built on Nov. 21, 2023, 9:07 a.m.