Arctic Lake Data (Aitchison)

Description

These data are taken from Aitchison (2003) and contain information on the relation of sediment composition with depth in an Arctic lake.

Usage

ArcticLake

Format

A data frame with 39 observations on the following 4 variables:

sand, silt, clay

relative frequencies of sand, silt, and clay

depth

water depth in meters

Source

Aitchison, J. (2003). The Statistical Analysis of Compositional Data. The Blackburn Press, Caldwell, NJ.

Examples

head(ArcticLake)
AL <- DR_data(ArcticLake[,1:3])
plot(AL)
summary(AL)

Results

R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

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Type 'demo()' for some demos, 'help()' for on-line help, or
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> library(DirichletReg)
Loading required package: Formula
Loading required package: rgl
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/DirichletReg/ArcticLake.Rd_%03d_medium.png", width=480, height=480)
> ### Name: ArcticLake
> ### Title: Arctic Lake Data (Aitchison)
> ### Aliases: ArcticLake
> ### Keywords: datasets
> 
> ### ** Examples
> 
> head(ArcticLake)
   sand  silt  clay depth
1 0.775 0.195 0.030  10.4
2 0.719 0.249 0.032  11.7
3 0.507 0.361 0.132  12.8
4 0.522 0.409 0.066  13.0
5 0.700 0.265 0.035  15.7
6 0.665 0.322 0.013  16.3
> AL <- DR_data(ArcticLake[,1:3])
Warning in DR_data(ArcticLake[, 1:3]) :
  not all rows sum up to 1 => normalization forced
> plot(AL)
> summary(AL)
This object contains compositional data with 3 dimensions.
Number of observations: 39 of which 39 ( 100% ) are valid.

Note: The data were normalized.
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>