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LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch...
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Transcript of LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch...
![Page 1: LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch citation indexing and searching scirus.](https://reader038.fdocuments.net/reader038/viewer/2022100523/5514d9a3550346b0338b54ee/html5/thumbnails/1.jpg)
LIS618 lecture 6
Thomas Krichel
2002-10-26
![Page 2: LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch citation indexing and searching scirus.](https://reader038.fdocuments.net/reader038/viewer/2022100523/5514d9a3550346b0338b54ee/html5/thumbnails/2.jpg)
Structure of talk
• course evaluations• OCLC firstsearch• citation indexing and searching• scirus
![Page 3: LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch citation indexing and searching scirus.](https://reader038.fdocuments.net/reader038/viewer/2022100523/5514d9a3550346b0338b54ee/html5/thumbnails/3.jpg)
citation indexing
• is a technique that can be used if there on documents that cite other documents– scientific papers– patents– legal documents
• pioneered by Shepherd's citation index to case law since 1870s
![Page 4: LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch citation indexing and searching scirus.](https://reader038.fdocuments.net/reader038/viewer/2022100523/5514d9a3550346b0338b54ee/html5/thumbnails/4.jpg)
citation vs word indexing
• word indexing as severe limitations– different authors use different words– language evolves, e.g. euphenics– controlled vocabularies can help but
• reduce the subject to the categories• are subject to human error
• in contrast citation indexing appears more mechanical and thus objective
![Page 5: LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch citation indexing and searching scirus.](https://reader038.fdocuments.net/reader038/viewer/2022100523/5514d9a3550346b0338b54ee/html5/thumbnails/5.jpg)
citation quality
• good citation data is a sign of good scholarship
• good citation data– has all relevant papers cited to show that the
authors are aware of related literature– citation has to conform to journal style
• but citation styles vary a lot for disciplines• citations in the hard sciences are a lot
more formal
![Page 6: LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch citation indexing and searching scirus.](https://reader038.fdocuments.net/reader038/viewer/2022100523/5514d9a3550346b0338b54ee/html5/thumbnails/6.jpg)
citation indexes to scientific papers
• essentially pioneered by Eugene Garfield
• chemical citation index in the late 50s
• index of genetics in the early 60s
• ISI issued an interdisciplinary science citation index in the 60s
• Extended to social science citation index and arts and humanities citation index
• virtual monopoly
![Page 7: LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch citation indexing and searching scirus.](https://reader038.fdocuments.net/reader038/viewer/2022100523/5514d9a3550346b0338b54ee/html5/thumbnails/7.jpg)
what sources to index
• Bradford's law would imply that it takes 500 to 1000 journals to cover the literature that is essential to a discipline
• Garfield's law of concentration says that the tail end of one discipline is core in another discipline.
• In SCI, mid 70s data– 50% of all citations are in 250 journals– 75% of all citations are in 1000 journals– 84% of all citations are in 2000 journals
![Page 8: LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch citation indexing and searching scirus.](https://reader038.fdocuments.net/reader038/viewer/2022100523/5514d9a3550346b0338b54ee/html5/thumbnails/8.jpg)
impact factor
• is the rate of citations that articles in a journal receive divided by the number of articles that a journal publisher
• has become over time a crucial indicator of journal quality
• given the ISI a monopoly position in the evaluation of journal quality
![Page 9: LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch citation indexing and searching scirus.](https://reader038.fdocuments.net/reader038/viewer/2022100523/5514d9a3550346b0338b54ee/html5/thumbnails/9.jpg)
citation index for a year
NAIR KG66 BIOCHEMESTRY 5 150
DESOUSA RC J PHYSL PAR R 71 5 75
MASLINSK. C AGENT ACTION 5 183 75
…
68 CIRCULATION RESEARCH 23ANVERSA P LAB INV 33 125 75
…
![Page 10: LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch citation indexing and searching scirus.](https://reader038.fdocuments.net/reader038/viewer/2022100523/5514d9a3550346b0338b54ee/html5/thumbnails/10.jpg)
Source index
LUTZ H
RETTENMA.G (DE) ULTRASONIC DIAGNOSIS OF RENAL DESEASE
DEUT MED WO 98 361 73 17RN8
• there is also a patent index
![Page 11: LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch citation indexing and searching scirus.](https://reader038.fdocuments.net/reader038/viewer/2022100523/5514d9a3550346b0338b54ee/html5/thumbnails/11.jpg)
type of searches
• citation verification – uses source index only
• eponymic search• methodology search• follow-up searches• review searches• precise question searches• exhaustive bibliographies
![Page 12: LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch citation indexing and searching scirus.](https://reader038.fdocuments.net/reader038/viewer/2022100523/5514d9a3550346b0338b54ee/html5/thumbnails/12.jpg)
usefulness of citation indexing
• subject categorization is – more precise – more stable– more flexible– more detailed
• reveals links between old and new papers
• draws our attention to events that have happened
![Page 13: LIS618 lecture 6 Thomas Krichel 2002-10-26. Structure of talk course evaluations OCLC firstsearch citation indexing and searching scirus.](https://reader038.fdocuments.net/reader038/viewer/2022100523/5514d9a3550346b0338b54ee/html5/thumbnails/13.jpg)
most successful application
• google uses graph structure of web links to distinguish between important and not important pages.
• pages that have many links to them by important pages are deemed to be important.