Michael Siff

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We describe a general technique for identifying modules in programs that do not designate them explicitly. The method is based on concept analysis | a branch of lattice theory that can be used to identify similarities among a set of objects based on their attributes. We discuss how concept analysis can identify potential modules using both \positive" and(More)
The use of type casts is pervasive in C. Although casts provide great flexibility in writing programs, their use obscures the meaning of programs, and can present obstacles during maintenance. Casts involving pointers to structures (C structs) are particularly problematic, because by using them, a programmer can interpret any memory region to be of any(More)
The fields of cluster analysis and concept analysis are both used to identify patterns in data. Concept analysis identifies similarities between sets of objects based on their attributes. Cluster analysis groups objects with related characteristics based on some notion of distance. In this paper, we investigate connections between these two approaches. In(More)
The epidemiology of smoking, factors which motivated students at the University of the Witwatersrand, Johannesburg, to smoke, to continue smoking or to stop smoking, and student awareness of the health hazards of smoking were investigated. Analysis of a random sample comprising 13% of the 12426 full-time undergraduate students at the university revealed(More)
The framework for concept analysis is a finite set of objects, a finite set of attributes, and a binary relation between the two sets that describes objects according to their attributes. A concept is a maximal rectangle in the relation. The goal of concept analysis is to compute concepts and to analyze them for significant groupings of objects and(More)
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