The terms LSO, LSI and LSA concern a semantic calculation used by Search Engines and which can be used in keyword research.

Latent Semantic Optimization (LSO)
LSO is the mapping of common keywords related to a target using a known issue / article and the subsequent (SEO) content optimization. By using the related keywords, the search position can be affected. It is also important that the related keywords are used as early as possible in the content and that they be placed as close as possible to be most successful.

Latent semantic indexing (LSI)
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 contexts tend to have similar meanings. A key feature of LSI is its ability to extract the conceptual content of a body of text by establishing associations between those terms that occur in similar contexts.

Latent Semantic Analysis (LSA)
LSA analyzes data to get relevant terms which are then to be determined to get a possible relevance on a keyword. Each keyword found, will get a certain degree of weight, the greater the weight, the more important the relevant keyword is. LSA is very similar to LSI, but focuses on the extra weight of a keyword.


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