# 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

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### 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

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