| pick.cases {rSPARCS} | R Documentation |
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