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Text analysis differs from traditional search in that, whereas search requires a user to know what he or she is looking for, text analysis attempts to discover information in a pattern that is not known beforehand (through the use of advanced techniques such as pattern recognition, natural language processing, machine learning and so on). By focusing on patterns and characteristics, text analysis can produce better search results and deeper data analysis, thereby providing quick retrieval of information that otherwise would remain hidden.
Text analysis is particularly interesting in areas where users must discover new information, such as in criminal investigations, legal discovery and when performing due-diligence investigations. Such investigations require 100% recall; i.e., users cannot afford to miss any relevant information. In contrast, a user who uses a standard search engine to search the Internet for background information simply requires any information as long as it is reliable. During due diligence, a lawyer certainly wants to find all possible liabilities and is not interested in finding only the obvious ones.
Challenges Facing Text Analysis
Due to the global reach of many investigations, a lot of interest also exists with text analysis in multi-language collections. Multi-language text analysis is much more complex than it appears because, in addition to differences in character sets and words, text analysis makes intensive use of statistics as well as the linguistic properties (such as conjugation, grammar, tenses or meanings) of a language. A number of multi-language issues will be addressed later in this article.
But perhaps the biggest challenge with text analysis is that increasing recall can compromise precision, meaning that users end up having to browse large collections of documents to verify their relevance. Standard approaches to countering decreasing precision rely on language-based technology, but when textcollections are not in one language, are not domain-specific and/or contain documents of variable sizes and types, these approaches often fail or are too sophisticated for users to comprehend what processes are actually taking place, thereby diminishing their control.
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Article Posted By :
shalini, Dated :
9/18/2009 5:19:01 AM
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