Exhaust from Burning Ethanol

Keywords: nonparametric regression, semiparametric regression

Description

This dataset is distributed with S-Plus as the dataframe ethanol.

The engine exhaust was analysed in an experiment in which ethanol was burned in a single cylinder automobile test engine. The response variable is NOx, the concentration of nitric oxide (NO) and nitrogen dioxide (NO2) in the engine exhaust, normalized by the work done by the engine. The explanatory variables are the compression ratio of the engine and the equivalence ratio at which the engine was run - a measure of the richness of the air/ethanol mix.


	Variable		Description

	NOx		Concentration of nitric oxide (NO) and nitrogen dioxide (NO2)
	Compression		Compression ratio
	Equivalence		Equivalence ratio

Download

Data File (tab-delimited text)

Source

Brinkman, N. D. (1981). Ethanol Fuel - A single-cylinder engine study of efficiency and exhaust emissions. SAE transactions, 90 (No 810345), 1410-1424.

Chambers, J. M., and Hastie, T. J., eds. (1992). Statistical Models in S. Wadsworth and Brooks, Pacific Grove, CA. pages 75, 222, 272-280, 331.

MathSoft, S-Plus software.

Analysis

The ethanol data set is used to illustrate a number of techniques in Chambers and Hastie (1992), but especially to illustrate nonparametric and local regression.