By Krzysztof J Cios; et al

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4. Advanced Data Storage While relational databases (warehouses) are usually used by businesses like retail stores and banks, other more specialized and advanced database systems have emerged in recent years. The new breed of databases satisfies the needs of more specialized users who must handle more than just numerical and nominal data. The new databases handle transactional data; spatial data, such as maps; hypertext, such as HTML and XML; multimedia data, such as combinations of text, image, video and audio; temporal data, such as time–related series concerning stock exchange and historical records; and the WWW, which is enormously large and distributed (and accessible via the Internet).

Next Generation of Data-Mining Applications, 415–444, IEEE Press Piscataway, NJ 13. , and Musilek, P. 2006. A survey of knowledge discovery and data mining process models. Knowledge Engineering Review, 21(1):1–24 14. Piatetsky-Shapiro, G. 1991. Knowledge discovery in real databases: a report on the IJCAI-89 workshop. AI Magazine, 11(5):68–70 15. , and Matheus, C. 1992. Knowledge discovery workbench for exploring business databases. International Journal of Intelligent Agents, 7(7):675–686 16.

For instance, when analyzing heart patient data, if one wanted to distinguish between sick and healthy patients but only demographic information was available, the task could be impossible to complete. In dealing with incomplete data, we first need to identify the problem and then take measures to remove it. To detect incompleteness, the user must analyze the existing data set and determine whether the existing features and objects give a sufficiently rich representation of the problem at hand.

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