lecture1-intro-handout-6-per

13 queryopmizaonexample moregeneralopmizaon

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Unformatted text preview: Views
each
document
as
a
set
of
words
   Is
precise:
document
matches
condi)on
or
not.
   Perhaps
the
simplest
model
to
build
an
IR
system
on
   Primary
commercial
retrieval
tool
for
3
decades.

   Many
search
systems
you
s)ll
use
are
Boolean:
   Largest commercial (paying subscribers) legal search service (started 1975; ranking added 1992)   Tens of terabytes of data; 700,000 users   Majority of users still use boolean queries   Example query:   What is the statute of limitations in cases involving the federal tort claims act?   LIMIT! /3 STATUTE ACTION /S FEDERAL /2 TORT /3 CLAIM   Email,
library
catalog,
Mac
OS
X
Spotlight
   /3 = within 3 words, /S = in same sentence 25
 Introduc)on to Informa)on Retrieval Sec. 1.4 Introduc)on to Informa)on Retrieval Sec. 1.4 26
 Sec. 1.3 Introduc)on to Informa)on Retrieval Boolean
queries:

 More
general
merges
 Example:
WestLaw


http://www.westlaw.com/   Another
example
query:
   Requirements
for
disabled
people
to
be
able
to
access
a
 workplace
   disabl!
/p
access!
/s
work‐site
work‐place
(employment
/3
 place)
   Note
that
SPACE...
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This document was uploaded on 02/26/2014.

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