Fuzzy representation of uncertainty in disease progression

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Title:	Fuzzy representation of uncertainty in disease progression
Author:	Bielefeld, Roger Alan
Description:	The concept of fuzziness appeared in 1965 as an alternative to the traditional probabilistic and statistical approaches to the problem of the handling of uncertainty in many contexts. The use of fuzzy numbers is investigated as a means of representing uncertainty resulting from data censoring with respect to disease progression in individuals. A vehicle for implementing fuzzy numbers and fuzzy temporal values and operations involving them, object-oriented programming, is used in an example application. uzzy representations of uncertain AIDS disease stage onset times are created for a simulated data set of AIDS patients. From the fuzzy disease stage onset times and from the known disease stage diagnosis times, fuzzy representations for the disease stages themselves at any time t are derived. Fuzzy descriptions of sizes of patient subpopulations based on race, sex, risk category, and disease stage are constructed both for complete disease stage diagnosis data and for both light (10%) and heavy (50%) censoring of HIV and ARC diagnosis data. All representations and operations are implemented in the object-oriented C++ language.
Permanent Link:	http://rave.ohiolink.edu/etdc/view?acc_num=case1060268903 http://hdl.handle.net/2374.OX/16440
Date:	1992

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Now showing item 66874 of 172559