The `foraminiferals` data set (Aitchison, 1986) is a classical example of paleocological compositional data. It contains the composition of four fossil types (Neogloboquadrina atlantica, Neogloboquadrina pachyderma, Globorotalia obesa, and Globigerinoides triloba) at 30 different depths.
Because the data contain rounded zeros, zero-replacement techniques are typically required before analysis. A natural goal is then to study the association between fossil composition and depth.
foraminiferalsAn object of class data.frame with 30 rows and 5 columns.