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\name{nox}
\alias{nox}
\title{NOx in Engine Exhaust}
\description{
Data from an experiment in which a single-cylinder engine was run
with ethanol to see how the NOx concentration in the exhaust
depended on the compression ratio and the equivalence ratio.
}
\usage{data(nox)}
\format{
A data frame containing 88 observations on the following variables.
\tabular{ll}{
\code{nox} \tab NOx concentration in exhaust.\cr
\code{comp} \tab Compression ratio.\cr
\code{equi} \tab Equivalence ratio.
}
}
\source{
Brinkman, N. D. (1981), Ethanol fuel -- a single-cylinder engine
study of efficiency and exhaust emissions. \emph{SAE Transactions},
\bold{90}, 1410--1424.
}
\references{
Cleveland, W. S. and Devlin, S. J. (1988), Locally weighted
regression: An approach to regression analysis by local fitting.
\emph{Journal of the American Statistical Association}, \bold{83},
596--610.
Breiman, L. (1991), The pi method for estimating multivariate
functions from noisy data. \emph{Technometrics}, \bold{33},
125--160.
}
\keyword{datasets}
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