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% File src/library/datasets/man/stackloss.Rd
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2025 R Core Team
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% Distributed under GPL 2 or later
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\name{stackloss}
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\docType{data}
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\alias{stackloss}
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\alias{stack.loss}
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\alias{stack.x}
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\title{\I{Brownlee}'s Stack Loss Plant Data}
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\description{
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  Operational data of a plant for the oxidation of ammonia to nitric
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  acid.
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}
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\usage{
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stackloss
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stack.x
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stack.loss
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}
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\format{
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  \code{stackloss} is a data frame with 21 observations on 4 variables.
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  \tabular{rll}{
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    [,1] \tab \samp{Air Flow}   \tab Flow of cooling air\cr
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    [,2] \tab \samp{Water Temp} \tab Cooling Water Inlet
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    Temperature\cr
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    [,3] \tab \samp{Acid Conc.} \tab Concentration of acid [per
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    1000, minus 500]\cr
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    [,4] \tab \code{stack.loss} \tab Stack loss\cr
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  }
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  For historical compatibility with S-PLUS, the data sets
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  \code{stack.x}, a matrix with the first three (independent) variables
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  of the data frame, and \code{stack.loss}, the numeric vector giving
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  the fourth (dependent) variable, are also provided.
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}
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\source{
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  \bibinfo{R:Brownlee:1965}{note}{Pages\sspace{}491--500}
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  \bibshow{R:Brownlee:1965}
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}
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\details{
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  \dQuote{Obtained from 21 days of operation of a plant for the
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    oxidation of ammonia (\I{NH\eqn{_3}{3}}) to nitric acid
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    (\I{HNO\eqn{_3}{3}}).  The nitric oxides produced are absorbed in a
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    countercurrent absorption tower}.
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  (\I{Brownlee}, cited by \I{Dodge}, slightly reformatted by MM.)
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  \samp{Air Flow} represents the rate of operation of the plant.
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  \samp{Water Temp} is the temperature of cooling water circulated
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  through coils in the absorption tower.
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  \samp{Acid Conc.} is the concentration of the acid circulating, minus
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  50, times 10: that is, 89 corresponds to 58.9 per cent acid.
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  \code{stack.loss} (the dependent variable) is 10 times the percentage
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  of the ingoing ammonia to the plant that escapes from the absorption
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  column unabsorbed; that is, an (inverse) measure of the over-all
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  efficiency of the plant.
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}
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\references{
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  \bibshow{R:Becker+Chambers+Wilks:1988, R:Dodge:1996}
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}
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\examples{
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require(stats)
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summary(lm.stack <- lm(stack.loss ~ stack.x))
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}
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\keyword{datasets}
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