% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/data.R
\docType{data}
\name{ArcticLake}
\alias{ArcticLake}
\title{Arctic lake sediment samples of different water depth}
\format{\itemize{
\code{ArcticLake$depth}: water depth (in meters). 

\code{ArcticLake$x}: compositions of three covariates: sand, silt, and clay.
}}
\source{
Aitchison: CODA microcomputer statistical package, 1986, the file name ARCTIC.DAT, here included under the GNU Public Library Licence Version 2 or newer.
}
\description{
Sand, silt and clay compositions of 39 sediment samples of different water 
depth in an Arctic lake.
}
\details{
Sand, silt and clay compositions of 39 sediment samples at different water 
depth (in meters) in an Arctic lake. The additional feature is a concomitant variable or 
covariate, water depth, which may account for some of the variation in the compositions. 
In statistical terminology, we have a multivariate regression problem with sediment 
composition as predictors and water depth as a response. All row percentage sums to 100, 
except for rounding errors.
}
\note{
Courtesy of J. Aitchison
}
\references{
Aitchison: The Statistical Analysis of Compositional Data, 1986, Data 5, pp5.
}
