Editing Probability vector (section)

{{Short description|Vector with non-negative entries that add up to one}}
{{redirect|Stochastic vector|the concept of a random vector|Multivariate random variable}}
In [[mathematics]] and [[statistics]], a '''probability vector''' or '''stochastic vector''' is a [[vector space|vector]] with non-negative entries that add up to one.

The positions (indices) of a probability vector represent the possible outcomes of a [[discrete random variable]], and the vector gives us the [[probability mass function]] of that random variable, which is the standard way of characterizing a [[discrete probability distribution]].<ref>{{citation
 | last = Jacobs | first = Konrad
 | doi = 10.1007/978-3-0348-8645-1
 | isbn = 3-7643-2591-7
 | mr = 1139766
 | page = 45
 | publisher = Birkhäuser Verlag, Basel
 | series = Basler Lehrbücher [Basel Textbooks]
 | title = Discrete Stochastics
 | url = https://books.google.com/books?id=2Rv_i4-01JEC&pg=PA45
 | volume = 3
 | year = 1992}}.</ref>