gamlss.data (version 4.2-0)

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)

docType

data

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))