AbundanceMatrix-class   Relative Frequency Matrix
CountMatrix-class       Absolute Frequency Matrix
IncidenceMatrix-class   Incidence Matrix
OccurrenceMatrix-class
                        Co-Occurrence Matrix
SimilarityMatrix-class
                        Similarity Matrix
StratigraphicMatrix-class
                        Stratigraphic Matrix
chronology              Chronological Information
coerce                  Coerce
geography               Spatial Information
mutator                 Get or Set Parts of an Object
subset                  Extract or Replace Parts of an Object
