Latent semantic indexing lsi is an indexing and retrieval method that uses a mathematical technique called singular value decomposition svd to identify patterns in the relationships between the terms and concepts contained in an unstructured collection of text lsi is based on the principle that words that are used in the same . This item latent semantic indexing handbook what you must know about latent semantic analysis set up a giveaway theres a problem loading this menu right now. In latent semantic indexing sometimes referred to as latent semantic analysis lsa we use the svd to construct a low rank approximation to the term document matrix for a value of that is far smaller than the original rank of . Latent semantic indexing sometimes referred to as latent semantic analysis is a mathematical method developed in the late 1980s to improve the accuracy of information retrieval