10 Sep 2003
CS 6210: Module 5
7/18
Number of index terms in record
¡Long (Exhaustive)
lGives good recall at cost of precision
lFew records fit in the UI
lHard to figure out which are main aspects
l
¡Short (Selective)
lGives good precision at cost of recall
lLess work
l
¡In practice: offer levels of indexing for tasks
lIndex Terms
lAbstract
¡
Number of terms assigned /
   cost
0
100
- Modified from
Lancaster (98), pg 27.
Text Box: % requests possible to satisfy
% requests possible to satisfy
* But note here that tf*idf can help