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Correspondence analysis (from a layman’s perspective) is like principal components analysis for categorical data. It can be useful to discover structure in this type of data. My friend Gianmarco Alberti, an archaeologist, has put together an in depth web site detailing the history, use and worked R examples of correspondence analysis. It’s like a FREE ebook 
The website: http://cainarchaeology.weebly.com/
Enjoy!!
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