Collection - MultiSet (bag or mset)

Venn Diagram

About

A multiset (aka bag or mset) is a set with one big difference because it allows for multiple instances of each of its elements (ie duplicate are allowed)

This is the same structure that would support a frequency distribution.

Documentation / Reference




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Relational Data Model
(Relation|Table) - Tabular data

A Relation is a logical data structure composed of tuple (row) attribute (column, field) The following data structure are a relation: a table, a materialized view (query) (store data) a query,...
Venn Diagram
Collection - Bag

A bag is an un-ordered list of elements that may contains duplicates. A bag is also known as a multiset. Multiset_(abstract_data_type)
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Frequency Distribution

A frequency distribution is a distribution of the frequency of each element ie the count of each element in a set or the count of each element in a period multiset
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Mathematics - Combination (Binomial coefficient|n choose k)

A combination is a selection of elements from a set where the order of selection does not matter. Order doesn't matter means that the selections AB and BA are considered a single combination (a single...



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