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