D J S ( P | | Q ) = 1 2 D K L ( P | | R ) + 1 2 D K L ( Q | | R ) {\displaystyle D_{JS}(P||Q)={\frac {1}{2}}D_{KL}(P||R)+{\frac {1}{2}}D_{KL}(Q||R)}
R = 1 2 ( P + Q ) {\displaystyle R={\frac {1}{2}}(P+Q)}
