Description

Data provide sand, silt and clay compositions of 21 sediments specimens, 10 of which are identified as offshore, 7 as near shore and 4 new samples.

Usage

Format

• sandnumeric: the portion of sand

• siltnumeric: the protion of silt

• claynumeric: the portion of clay

• typenumeric: 1 for offshore, 2 for near shore and 3 for new samples

Details

The data comprise 21 cases: 10 offshore, 7 near shore and 4 new samples, and 4 variables: sand, silt and clay proportions and in addition the type of sediments specimens – 1 for offshore, 2 for near shore and 3 for new samples.

All 3-part compositions sum to one.

Note

Courtesy of J. Aitchison

Source

Aitchison: CODA microcomputer statistical package, 1986, the file name YATQUAD.DAT, here included under the GNU Public Library Licence Version 2 or newer.

References

Aitchison, J. (1986) The Statistical Analysis of Compositional Data, (Data 20) pp17.