ArcticLake: Arctic Lake Data (Aitchison)

Description Usage Format Source Examples

Description

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

Usage

1

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

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

Example output

Loading required package: Formula
Loading required package: rgl
Warning messages:
1: In rgl.init(initValue, onlyNULL) : RGL: unable to open X11 display
2: 'rgl_init' failed, running with rgl.useNULL = TRUE 
3: .onUnload failed in unloadNamespace() for 'rgl', details:
  call: fun(...)
  error: object 'rgl_quit' not found 
   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
Warning in DR_data(ArcticLake[, 1:3]) :
  not all rows sum up to 1 => normalization forced
This object contains compositional data with 3 dimensions.
Number of observations: 39 of which 39 ( 100% ) are valid.

Note: The data were normalized.

DirichletReg documentation built on May 29, 2017, 7:09 p.m.