| % File src/library/datasets/man/stackloss.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2007 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{stackloss} |
| \docType{data} |
| \alias{stackloss} |
| \alias{stack.loss} |
| \alias{stack.x} |
| \title{Brownlee's Stack Loss Plant Data} |
| \description{ |
| Operational data of a plant for the oxidation of ammonia to nitric |
| acid. |
| } |
| \usage{ |
| stackloss |
| |
| stack.x |
| stack.loss |
| } |
| \format{ |
| \code{stackloss} is a data frame with 21 observations on 4 variables. |
| |
| \tabular{rll}{ |
| [,1] \tab \code{Air Flow} \tab Flow of cooling air\cr |
| [,2] \tab \code{Water Temp} \tab Cooling Water Inlet |
| Temperature\cr |
| [,3] \tab \code{Acid Conc.} \tab Concentration of acid [per |
| 1000, minus 500]\cr |
| [,4] \tab \code{stack.loss} \tab Stack loss\cr |
| } |
| |
| For compatibility with S-PLUS, the data sets \code{stack.x}, a matrix |
| with the first three (independent) variables of the data frame, and |
| \code{stack.loss}, the numeric vector giving the fourth (dependent) |
| variable, are provided as well. |
| } |
| \source{ |
| Brownlee, K. A. (1960, 2nd ed.\sspace{}1965) |
| \emph{Statistical Theory and Methodology in Science and Engineering}. |
| New York: Wiley. pp.\sspace{}491--500. |
| } |
| \details{ |
| \dQuote{Obtained from 21 days of operation of a plant for the |
| oxidation of ammonia (NH\eqn{_3}{3}) to nitric acid |
| (HNO\eqn{_3}{3}). The nitric oxides produced are absorbed in a |
| countercurrent absorption tower}. |
| (Brownlee, cited by Dodge, slightly reformatted by MM.) |
| |
| \code{Air Flow} represents the rate of operation of the plant. |
| \code{Water Temp} is the temperature of cooling water circulated |
| through coils in the absorption tower. |
| \code{Acid Conc.} is the concentration of the acid circulating, minus |
| 50, times 10: that is, 89 corresponds to 58.9 per cent acid. |
| \code{stack.loss} (the dependent variable) is 10 times the percentage |
| of the ingoing ammonia to the plant that escapes from the absorption |
| column unabsorbed; that is, an (inverse) measure of the over-all |
| efficiency of the plant. |
| } |
| \references{ |
| Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) |
| \emph{The New S Language}. |
| Wadsworth & Brooks/Cole. |
| |
| Dodge, Y. (1996) |
| The guinea pig of multiple regression. In: |
| \emph{Robust Statistics, Data Analysis, and Computer Intensive |
| Methods; In Honor of Peter Huber's 60th Birthday}, 1996, |
| \emph{Lecture Notes in Statistics} \bold{109}, Springer-Verlag, New York. |
| } |
| \examples{ |
| require(stats) |
| summary(lm.stack <- lm(stack.loss ~ stack.x)) |
| } |
| \keyword{datasets} |
| |