Count

The number of data values in a set

Count({x_i})=n

Top m, Bottom m

The set of the largest (smallest) m values from a set. May be generated via an SQL command

Top_m{x_i}={X_n‑m+1,…X_n‑1,X_n};

Bot_m{x_i}={X₁,X₂,… X_m};

Variety

The number of distinct i.e. different data values in a set. Some packages refer to the variety as diversity, which should not be confused with information theoretic and other diversity measures

Majority

The most common i.e. most frequent data values in a set. Similar to mode (see below), but often applied to raster datasets at the neighborhood or zonal level. For general datasets the term should only be applied to cases where a given class is 50%+ of the total

Minority

The least common i.e. least frequently occurring data values in a set. Often applied to raster datasets at the neighborhood or zonal level

Maximum, Max

The maximum value of a set of values. May not be unique

Max{x_i}=X_n

Minimum, Min

The minimum value of a set of values. May not be unique

Min{x_i}=X₁

Sum

The sum of a set of data values