15.1.3 The probability ranking principle(PRP)

• recall, precision $B$N$&$A$I$A$i$r=E;k$9$l$P$$$$$N$+(B? $\rightarrow$ recall
  • $B$"$kDxEY(B recall $B$N$"$k8!:w7k2L$+$iBEEv$J(B document $B$r(B $BC5$9$N$O?Mrecall $B$N>.$5$$(B $B8!:w7k2L$@$H(B, $B;D$j$NKDBg$J8!:wBP>]$+$i(B $B?M
  • RPR

    1.

    $B3F(B document $B$OFHN)$J$b$N$H$7$F07$&(B, P(R|d₁), P(R|d₂) $B$OFHN)(B

    2.

    $BJ#?t$N>pJs$r;}$A(B,$BJ#?t$N2rl9g(B, $B$=$l$>$l$N2r jaguar $B$NNc(B (car or animal)
    $B[#Kf@-$r5v$7$?$^$^:GNI$J$b$N$rA*$V$N$G$O$J$/(B, car $B$H$$$&2r3.

    $B4XO"$,$"$k$+$I$&$+$N3NN($O(B, $B?dDj$N$_$K$h$C$F5a$^$k(B, $B4XO"$,$"$k$+$NI>2A$O8D?M:9$,$"$k(B