gamlss.data (version 6.0-6)

acidity: The Acidity Data files for GAMLSS

Description

The data shows the acidity index for 155 lakes in the Northeastern United States (previously analysed as a mixture of gaussian distributions on the log scale by Crawford et al.(1992, 1994)). These 155 observations are the log acidity indices for the lakes.

Usage

data(acidity)

Format

A data frame with 155 observations on the following variable.

y

a numeric vector showing the acidity index for 155 lakes in the Northeastern United States

References

Crawford S.L., DeGroot M.H., Kadane J.B., and Small M.J. (1992), Modeling lake-chemistry distributions: Approximate Bayesian methods for estimating a finite-mixture model, Technometrics, 34, pp 441-450.

Crawford S.L. (1994) An application of the Laplace method to finite mixture distributions, JASA, 89. pp 269-278.

McLachlan G. and Peel D., Finite Mixture Models, Wiley, New York.

Examples

data(acidity)
with( acidity, hist(y))