Chi-squared divergence
= Chi-squared divergence
{title2=$\chi^2(P\Vert Q)$}
{wiki}
For <probability mass functions> $P,Q$ with $P$ absolutely continuous with respect to $Q$,
$$
\chi^2(P\Vert Q)=\sum_x\frac{(P(x)-Q(x))^2}{Q(x)}.
$$
= Chi-squared divergence
{title2=$\chi^2(P\Vert Q)$}
{wiki}
For <probability mass functions> $P,Q$ with $P$ absolutely continuous with respect to $Q$,
$$
\chi^2(P\Vert Q)=\sum_x\frac{(P(x)-Q(x))^2}{Q(x)}.
$$