Information Retrieval Lab

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Presentation transcript:

Information Retrieval Lab CSC 9010: Special Topics. Natural Language Processing. Paula Matuszek, Mary-Angela Papalaskari Spring, 2005 CSC 9010: Special Topics, Natural Language Processing. Spring, 2005. Matuszek & Papalaskari

Exploring some IR tools You are probably all familiar with web-based IR tools, but we are going to play with three rather different ones today, mostly to look at their cababilities. Google advanced search: http:www.google.com/advanced_search Teoma: http://www.teoma.com/ MedLine: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi CSC 9010: Special Topics, Natural Language Processing. Spring, 2005. Matuszek & Papalaskari

Each of these tools has basic and advanced interfaces. Basic Interface Each of these tools has basic and advanced interfaces. Try some queries on the basic interfaces Then try some advanced query interfaces. From Pubmed/Medline, click on the Limits tab to get to it. What do they have in common? How do they differ? CSC 9010: Special Topics, Natural Language Processing. Spring, 2005. Matuszek & Papalaskari

Some Features of Each Google uses primarily a citation graph weighting to determine relevance, rather than keyword or other linguistic factors. MedLine has a careful controlled vocabulary which can be used from the Limits tab Teoma takes questions, not just keywords, and the results page includes a “Refine” section. CSC 9010: Special Topics, Natural Language Processing. Spring, 2005. Matuszek & Papalaskari

What worked well in the different engines? Exercise Look for answers to these questions in the different engines: (some won’t give you much in MedLine) What are effective treatments for Type 2 diabetes? What towns are in North Carolina’s Outer Banks ? Where can I open a checking account in Villanova? And try some of your own. What worked well in the different engines? Did the special features help? CSC 9010: Special Topics, Natural Language Processing. Spring, 2005. Matuszek & Papalaskari