{ "data_id": "17", "name": "bridges", "exact_name": "bridges", "version": 1, "version_label": "1", "description": "**Author**: \n**Source**: Unknown - \n**Please cite**: \n\n1. Title: Pittsburgh bridges\n \n 2. Sources:\n -- Yoram Reich & Steven J. Fenves\n Department of Civil Engineering\n and\n Engineering Design Research Center\n Carnegie Mellon University\n Pittsburgh, PA 15213\n \n Compiled from various sources.\n \n -- Donor: Yoram Reich (yoram.reich@cs.cmu.edu)\n -- Date: 1 August 1990\n \n 3. Past Usage:\n \n -- Reich & Fenves (1989). Incremental Learning for Capturing Design \n Expertise. Technical Report: EDRC 12-34-89, Engineering Design\n Research Center, Carnegie Mellon University, Pittsburgh, PA.\n -- Qualitative results and runs with original ordering of examples.\n using COBWEB.\n \n -- Reich (1989). Converging to ``Ideal'' Design Knowledge by Learning,\n Proceedings of the First International Workshop on Formal Methods in\n Engineering Design, pp: 330-349, Colorado Springs, CO, January 1990.\n -- Describes a new design method with Bridger (variant of COBWEB) using\n \t this domain. (Also an EDRC report: 12-35-89)\n \n -- Reich (1989) Combining Nominal and Continuous Properties in an \n Incremental Learning System for Design. Technical Report: EDRC 12-33-89.\n -- Comparison of performance of Bridger when running on both versions\n \t (V1 and V2) of the database\n \n -- Reich (1989) Incremental Concept Formation with Mixed Property Types\n Unpublished Manuscript.\n -- Results using 10 random 10-fold cross-validation test with Bridger\n \t (relative error rate):\n \t Version V1 of the database: \n \t MATERIAL 18.4%, REL-L 38.7%, SPAN 42.7%, T-OR-D 14.7%, TYPE 47.6%.\n \t Version V2 of the database:\n \t MATERIAL 24.2%, REL-L 41.7%, SPAN 39.9%, T-OR-D 14.7%, TYPE 56.5%.\n \n -- Quinlan (1989) Personal communication. \n -- Results of a 10-fold cross-validation test with C4.5, and with\n a separate decision tree for each design property obtained the \n \t following error rates on version V1 of the database:\n \t MATERIAL 15%, REL-L 32%, SPAN 32%, T-OR-D 15%, TYPE 44%.\n \n 4. Number of instances: 108\n \n 5. Relevant Information:\n \n There are two versions to the database: \n V1 contains the original examples and \n V2 contains descriptions after discretizing numeric properties.\n \n There are no ``classes'' in the domain. Rather this is a DESIGN domain where\n 5 properties (design description) need to be predicted based on 7 \n specification properties.\n \n 6. Number of Attributes: 13: 7 specifications, 5 design description, and 1\n identifier (not used for the classification)\n \n 7. Attribute Information: \n \n The type field state whether a property is continuous\/integer (c) \n \t\t\t\t\t\t or nominal (n).\n For properties with c,n type, the range of continuous numbers is given \n first and the possible values of the nominal follow the semi-colon.\n \n \n name type possible values\t\tcomments\n ------------------------------------------------------------------------\n 1. IDENTIF\t-\t-\t\t\tidentifier of the examples\n 2. RIVER\tn\tA, M, O\n 3. LOCATION\tn 1 to 52\n 4. ERECTED\tc,n\t1818-1986 ; CRAFTS, EMERGING, MATURE, MODERN\n 5. PURPOSE\tn\tWALK, AQUEDUCT, RR, HIGHWAY\n 6. LENGTH\tc,n\t804-4558 ; SHORT, MEDIUM, LONG\n 7. LANES\tc,n\t1, 2, 4, 6 ; 1, 2, 4, 6\n 8. CLEAR-G\tn\tN, G\n 9. T-OR-D\tn\tTHROUGH, DECK\n 10. MATERIAL\tn\tWOOD, IRON, STEEL\n 11. SPAN\tn\tSHORT, MEDUIM, LONG\n 12. REL-L\tn\tS, S-F, F\n 13. TYPE\tn\tWOOD, SUSPEN, SIMPLE-T, ARCH, CANTILEV, CONT-T\n \n \n 8. More complicated attributes:\n \n One can use a hierarchical structure for the Type property. There are two\n options.\n \n \toption 1 (use examples without modification)\n --------\n \n \t\t\tType \n \t \/ \/\t \n \t \/ \/\t \t \n \twood\tsuspen\t\tarch\ttruss\n \t\t\t\t \/ | \n \t\t\t\t \/ | \n \t\t\t\tcantilev cont-t simple\n \n \n \toption 2 (requires changes in the Type property - specified bellow)\n \t--------\n \n \t\t\t\tType \n \n \t\t \/ \t\/ |\t \t \t\n \t \t\/ \/\t | \t\t \n \t wood suspen\tarch\t\t truss\n \t\t\t\t\/ \t \t \/ | \n \t\t\t \/\t \t \t \/ | \t\n \t\t\ttied-a not-tied cantilev cont-t simple arch-t\n \n \n \tChange the Type property of the following examples (in both V1 and V2):\n \t\tE28 -> arch-t\n \t\tE91,E90,E84,E83,E73 -> tied-a\n \t\tE97,E78,E77,E75,E66,E64,E43 -> not-tied\n \n \n 9. 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Fenves Department of Civil Engineering and Engineering Design Research Center Carnegie Mellon University Pittsburgh, PA 15213 Compiled from various sources. -- Donor: Yoram Reich (yoram.reich@cs.cmu.edu) -- Date: 1 August 1990 3. Past Usage: -- Reich & Fenves (1989). Incremental Learning for Capturing Design Expertise. 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