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Do computer programs exist that comapre and analyze documents for similarities?

I'm searching for computer programs that can compare documents (such as students' reports) and compare their content (the sentences) against each other and determine how statistically one report is similar to the other one. In other words, I'm looking to determine if one student's report is plagiarized from another student's report.
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code_talker
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code_talker
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2 Solutions
 
yoogi88Commented:
We use similar software for legal documents
http://www.workshare.com/products/wsprofessional/
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JMorganReadCommented:
Absolutely.  Educators often use TurnitIn (www.turnitin.com), but DocCop seems to be more what you're looking for (http://www.doccop.com/).  It can do many things, but one thing it does well is compare two documents to each other.  It's free, which is nice, but it doesn't do a lot of the advanced things that products like TurnitIn or Ithenticate do (plagiarizing by excessive use of the Thesaurus, for example).
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code_talkerAuthor Commented:
JMorganRead,

The problem is that the programs you listed archive the materials submitted for comparison. However, because of privacy, legal and material sensitivity concerns, I cannot allow the documents that I'm comparing to be stored/archived.  Additionally, I'm looking to compare one document to a specific second one, not one document to a database of other documents.
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JMorganReadCommented:
Your specific requests are why I included DocCop.  

It doesn't store submitted material
and it allows you to compare one document against another specific document.
I just suggested the other so you could weigh pros and cons.  Again, hope this helps.
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