Once you have identified the exact duplicate comments, the next step is to cluster similar comments and to automatically highlight the unique text, deletions and edits found in the clustered, modified form letters. First, click on the “Archive Menu” arrow at the right end of the original archive name. Then, select “Generate Near-duplicate Clustering”.


PCAT will estimate the time required to perform the clustering operation. When the operation is complete, the user will get a notification a second sub-archive will appear.

Why would I use this system? | Where do I get FDMS bulk downloads? | Does PCAT identify duplicates? | What is QDAP?

© 2009 - 2010 Qualitative Data Analysis Program (QDAP), in the University Center for Social and Urban Research, at the University of Pittsburgh, and QDAP-UMass, in the College of Social and Behavioral Sciences, at the University of Massachusetts Amherst. As of 2010, PCAT and this PCAT Help Wiki are maintained and improved by personnel from Texifter, LLC, which is a software start-up located in North Amherst & Springfield, MA and online at http://texifter.com.

Content on this website was made possible with the following grants from the National Science Foundation: III-0705566 “Collaborative Research III-COR: From a Pile of Documents to a Collection of Information: A Framework for Multi-Dimensional Text Analysis” and IIS-0429293 “Collaborative Research: Language Processing Technology for Electronic Rulemaking.” We are also grateful for financial support from the U.S. Environmental Protection Agency and the U.S. Fish & Wildlife Service. Any opinions, findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect those of the National Science Foundation.

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