You know, the well-known strategy in information retrieval named "Latent Semantic Analysis" also has another name "Latent Semantic Indexing". Is there any difference between the words here "Analysis" and "Indexing"? Can they be used in the same way?
LSA and LSI are closely related - LSI came first and was deployed in the area of IR, whereas LSA came slightly later and was used more for semantic understanding and also exploring various cognitive models of human lexical acquisition. In my view the difference between LSI and LSA is fairly slight - while LSI buildes a term by document matrix, LSA has often relied on term by article matrices (hoping to better capture the semantics of words and phrases). Anyway, my feeling is that they are near synonyms where the difference depends on your application (IR or lexical semantics) or perhaps your orientation (retrieval tool versus cognitive model)
@ Shudong, Latent Semantic Analysis is a technique in natural language processing and in the context of it's application to information retrieval, it is some times called Latent Semantic Indexing
In general case, and indexer builds an index for retrieval purposes by using the information provided by an analyzer. So .. an indexing process includes an analysis step.
Efficient information retrieval is the goal of building indices.
In this particular case, it seems that the two names often refers to the same method. I supose that this is due to the fact that the retrival performance is how one demonstrates the effectiveness of the analyzers.
Here some wikipedia links:
http://en.wikipedia.org/wiki/Latent_semantic_analysis
http://en.wikipedia.org/wiki/Latent_semantic_indexing
LSA and LSI are closely related - LSI came first and was deployed in the area of IR, whereas LSA came slightly later and was used more for semantic understanding and also exploring various cognitive models of human lexical acquisition. In my view the difference between LSI and LSA is fairly slight - while LSI buildes a term by document matrix, LSA has often relied on term by article matrices (hoping to better capture the semantics of words and phrases). Anyway, my feeling is that they are near synonyms where the difference depends on your application (IR or lexical semantics) or perhaps your orientation (retrieval tool versus cognitive model)
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