ozoneSub: Ozone levels in midwest U.S.A.

In HRW: Datasets, Functions and Scripts for Semiparametric Regression Supporting Harezlak, Ruppert & Wand (2018)

Ozone levels in midwest U.S.A.

Description

This dataset is a subset of the ozone2 dataset in the fields package. It contains the 8-hour average ozone concentration at 147 sites in the midwest region of the U.S.

Usage

data(ozoneSub)

Format

A data frame with 147 observations on the following 3 variables:

longitude

observation longitude.

latitude

observation latitude.

ozone

ozone level.

Source

Aerometric Information Retrieval System, the U.S. Environmental Protection Agency air quality data base.

References

Nychka, D., Furrer, R., Paige, J. and Sain, S. (2017). fields: Tools for spatial data. R package version 9.0. https://www.r-project.org.

Examples

library(HRW) ; data(ozoneSub)
if (require("mgcv"))
{
   fit.ozone.mgcv.tp <- gam(ozone ~ s(longitude,latitude,bs = "tp"),
                            data = ozoneSub,method = "REML")
   plot(fit.ozone.mgcv.tp,scheme = 2,
        main = "ozone concentration",bty = "l")
   points(ozoneSub$longitude,ozoneSub$latitude)
}
if (require("fields"))
   US(add = TRUE,lwd = 2)

HRW documentation built on Jan. 23, 2026, 9:07 a.m.