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D.R. Jones Judy Kaul Case Western Reserve University School of Law Library Plagiarism Detection...
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Transcript of D.R. Jones Judy Kaul Case Western Reserve University School of Law Library Plagiarism Detection...
D.R. Jones
Judy Kaul
Case Western Reserve University School of Law Library
Plagiarism Detection Software2
CALI 2004: Plagiarism Detection Software
PDS
Bibliography lists articles that evaluate various systems
Some no longer in existence Beware of My Drop Box, aka Plagiserve,
EduTie.com: Suspected of uploading student papers to term paper mills
CALI 2004: Plagiarism Detection Software
Detection with Software or Systems
Natural language (text) programs Turnitin (Plagiarism.org)
http://www.plagiarism.org http://www.turnitin.com
Essay Verification Engine (EVE2) http://www.canexus.com/eve/
CALI 2004: Plagiarism Detection Software
Detection with Software
Glatt CD-ROM Tests students knowledge of “own” work
WCopyFind: Used with Google or other search engines
Alternative tool: LexisNexis CiteCheck
CALI 2004: Plagiarism Detection Software
Turnitin: What It Does
Searches 8-word strings Currently searches against 3 databases of content:
Currently & extensively archived copy of publicly accessible Internet pages & term paper mills (2 billion)
ABI/Inform, Periodical Abstracts, Business Dateline (ProQuest)
“Tens of thousands of electronic books” Every student paper ever submitted to Turnitin Does seem to retrieve PDFs
CALI 2004: Plagiarism Detection Software
Turnitin: What It Does
iThenticate© algorithm: able to detect embedded paragraphs from multiple sources
CALI 2004: Plagiarism Detection Software
Turnitin: Reports
Yields Two Reports Printable report: 2 sections Originality Report: 3 sections Percentage of Suspected Plagiarism Color
Coded
CALI 2004: Plagiarism Detection Software
Turnitin: Limitations
Once submitted, a paper is only reported as a paper in the database- no originality report—even if serious evidence exists
Reports first several relevant hits—but they may not be the actual official original source
Presently does not search LexisNexis, Westlaw & Hein-Online
CALI 2004: Plagiarism Detection Software
Turnitin: Value to Law Schools
Value for Law Schools could be improved if it could also search LexisNexis, Westlaw and Hein-Online
CALI 2004: Plagiarism Detection Software
EVE2: What It Does
User identifies file from local system EVE2 strips formatting –turns into plain text Uses “Advanced Searching Tools” to match
potential sources from the internet Does search term paper mills Not much more information forthcoming
from EVE
CALI 2004: Plagiarism Detection Software
EVE2: Limitations
Seems to ignore punctuation, e.g., quotation marks, resulting in false hits
Varying results If you run 3 times in a row, you can get different
percentage of suspected plagiarism
CALI 2004: Plagiarism Detection Software
EVE2: Advantages
Low-cost if you just have a one-time paper you need to check Even Turnitin will recommend this product
Generates report in RTF and saves automatically to your hard drive
CALI 2004: Plagiarism Detection Software
Turnitin Pricing
Site license: Plagiarism Prevention Single campus institution (12 months) $500.00 annual licensing fee + .60 per
student (Minimum: $1100.00) Unlimited classes/instructors Unlimited originality reports Campus administrator with department
administrator options
CALI 2004: Plagiarism Detection Software
Turnitin Pricing - Extras
Additional costs for: Extended HelpDesk for Faculty (E-mail only)
would be 20% total cost: $220 Extended HelpDesk for Faculty & Students (E-
mail only) = 30% total cost: $330
CALI 2004: Plagiarism Detection Software
EVE2
Time consuming search runs from your computer Searches the internet, including term paper mills Yields 2 part report:
List of sources Highlighted student paper Click on comparison option to see side-by-side Also time consuming
CALI 2004: Plagiarism Detection Software
WCopyFind
http://plagiarism.phys.virginia.edu/Wsoftware.html Developed at University of Virginia Simple program Generates report comparing the student paper and
documents you locate with Google. Shareware Limitation: Finding sources for comparison Limitation: Doesn’t search internet or databases
CALI 2004: Plagiarism Detection Software
LexisNexis CheckCite
Not a PDS You can get clues that quotation marks are
missing Only works with cases and law review
articles Only generates sample report for case law?
CALI 2004: Plagiarism Detection Software
Demos
http://www.turnitin.com/ Eve2 http://www.canexus.com/eve/ WCopyFind http://plagiarism.phys.virginia.edu/Wsoftware.html
CALI 2004: Plagiarism Detection Software
Plagiarism Detection Strategies
Most complete list in Paul Clough’s article:
“Plagiarism in Natural and Programming Languages: An Overview of Current Tools and Technologies” (2000)
http://www.dcs.shef.ac.uk/~clough/papers/Plagiarism.pdf
CALI 2004: Plagiarism Detection Software
Clough’s Detection Strategies
Uses of vocabulary Changes in vocabulary Dependence on unique words & phrases Frequency of words Distribution of words Common spelling mistakes
CALI 2004: Plagiarism Detection Software
Clough’s List
Statistical similarities Readability of text
Flesch Reading Ease Formula SMOG Index
Average length of sentences (words) Average length of paragraphs (sentences) Usage of passive voice (expressed as percentage) Number of prepositions as % of total number of words
CALI 2004: Plagiarism Detection SoftwareClough’s Detection Strategies
(continued)
Long sequences common text – unattributed
Order of presentation of information, facts Amount of similarity of text Sudden incoherence of text Preference for long or short sentences