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Reference.org
Probability vector
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a> and <a href="/facts/Statistics/DNPsKGYU">statistics</a>, a probability vector or stochastic vector is a <a href="/facts/Vector_space/M1pxMLx2">vector</a> with non-negative entries that add up to one. </p><p>The positions (indices) of a probability vector represent the possible outcomes of a <a href="/facts/Discrete_random_variable/TwTBXnLT">discrete random variable</a>, and the vector gives us the <a href="/facts/Probability_mass_function/LhurokRt">probability mass function</a> of that random variable, which is the standard way of characterizing a <a href="/facts/Discrete_probability_distribution/EpsKKVRu">discrete probability distribution</a>. </p>