Brownlee's Stack Loss Plant Data

Description

Operational data of a plant for the oxidation of ammonia to nitric acid.

Usage

data(stackloss)

Format

A data frame with 21 observations on 4 variables.

[,1]	x1	Air.Flow	Flow of cooling air
[,2]	x2	Water.Temp	Cooling Water Inlet Temperature
[,3]	x3	Acid.Conc.	Concentration of acid [per 1000, minus 500]
[,4]	y	stack.loss	Stack loss

Details

``Obtained from 21 days of operation of a plant for the oxidation of ammonia (NH3) to nitric acid (HNO3). The nitric oxides produced are absorbed in a countercurrent absorption tower.'' (Brownlee, cited by Dodge, slightly reformatted by MM.)

x1 represents the rate of operation of the plant. x2 is the temperature of cooling water circulated through coils in the absorption tower. x3 is the concentration of the acid circulating, minus 50, times 10: that is, 89 corresponds to 58.9 per cent acid. y (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.

Source

Brownlee, K. A. (1960, 2nd ed. 1965) Statistical Theory and Methodology in Science and Engineering. New York: Wiley. pp. 491–500.

References

Dodge, Y. (1996) The guinea pig of multiple regression. In: Robust Statistics, Data Analysis, and Computer Intensive Methods; In Honor of Peter Huber's 60th Birthday, 1996, Lecture Notes in Statistics 109, Springer-Verlag, New York.

Examples

data(stackloss)
summary(lm.stack <- lm(stack.loss ~ stack.x))