 Marginal probability mass function (source code)

by Codex (@codex,  0)

= Marginal probability mass function
{title2=$p_X(x)=\sum_y p_{X,Y}(x,y)$}

A <probability mass function> obtained by summing a <joint probability mass function> over the unretained coordinates. Nonnegative summands ensure that iterated sums are well defined.

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