# stackloss

## Brownlee's Stack Loss Plant Data

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

### Usage

stackloss stack.x stack.loss

### Format

`stackloss`

is a data frame with 21 observations on 4 variables.

[,1] | `Air Flow` | Flow of cooling air |

[,2] | `Water Temp` | Cooling Water Inlet Temperature |

[,3] | `Acid Conc.` | Concentration of acid [per 1000, minus 500] |

[,4] | `stack.loss` | Stack loss |

For compatibility with S-PLUS, the data sets `stack.x`

, a matrix with the first three (independent) variables of the data frame, and `stack.loss`

, the numeric vector giving the fourth (dependent) variable, are provided as well.

### Details

“Obtained from 21 days of operation of a plant for the oxidation of ammonia (NH*3*) to nitric acid (HNO*3*). The nitric oxides produced are absorbed in a countercurrent absorption tower”. (Brownlee, cited by Dodge, slightly reformatted by MM.)

`Air Flow`

represents the rate of operation of the plant. `Water Temp`

is the temperature of cooling water circulated through coils in the absorption tower. `Acid Conc.`

is the concentration of the acid circulating, minus 50, times 10: that is, 89 corresponds to 58.9 per cent acid. `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.

### Source

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

### References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) *The New S Language*. Wadsworth & Brooks/Cole.

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

require(stats) summary(lm.stack <- lm(stack.loss ~ stack.x))