检索效果的评价可以用查全率(Recall ratio,简称 R )和查准率 (Precision ratio ,简称 P ) 两个指标来衡量。假设某一次检索 的 结果 中 为 a 符合要求的文献(检准信息), b 为不符 合要求的文献(误检信息),除此之外,还有 c 是数据库中符合要求但未被检索出来的信 息(漏检信息)。那么此次检索的查准率 P 应该如何计算?
A.
c / ( a + c )× 100%
B.
a /( a + b )× 100%
C.
b/( a + b ) × 100%
D.
a/( a + c ) × 100%
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【简答题】An 80-year-old man was sitting on the sofa in his house along with his 45-year-old highly educated son. Suddenly a crow(乌鸦)perched on the tree near their window. The father asked his son, “What is thi...
【简答题】An 80-year-old man was sitting on the sofa in his house along with his 45-year-old highly educated son. Suddenly a crow perched on their window. The father asked his son, “What is this?” The son repli...