A logic-based approach to conceptual data base analysis
Ryszard S. Michalski, Angela Baskin, Kent A. Spackman · Medical Informatics · 1983
This paper presents a logic-based data base analysis system that meets the above needs by using logical operations on non-numeric data (nominal data) and numeric operations only where such operations are most appropriate. The interaction with the system is done using a very simple and easy-to-use formal language based on the variable-valued logic calculus. Combined with the ability to handle incompletely- or imprecisely-specified data, this system provides a new and potentially widely applicable tool for the analysis of data bases