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95 lines
3.4 KiB
Plaintext
Executable File
95 lines
3.4 KiB
Plaintext
Executable File
1. Title: Glass Identification Database
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2. Sources:
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(a) Creator: B. German
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-- Central Research Establishment
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Home Office Forensic Science Service
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Aldermaston, Reading, Berkshire RG7 4PN
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(b) Donor: Vina Spiehler, Ph.D., DABFT
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Diagnostic Products Corporation
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(213) 776-0180 (ext 3014)
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(c) Date: September, 1987
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3. Past Usage:
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-- Rule Induction in Forensic Science
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-- Ian W. Evett and Ernest J. Spiehler
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-- Central Research Establishment
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Home Office Forensic Science Service
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Aldermaston, Reading, Berkshire RG7 4PN
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-- Unknown technical note number (sorry, not listed here)
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-- General Results: nearest neighbor held its own with respect to the
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rule-based system
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4. Relevant Information:n
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Vina conducted a comparison test of her rule-based system, BEAGLE, the
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nearest-neighbor algorithm, and discriminant analysis. BEAGLE is
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a product available through VRS Consulting, Inc.; 4676 Admiralty Way,
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Suite 206; Marina Del Ray, CA 90292 (213) 827-7890 and FAX: -3189.
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In determining whether the glass was a type of "float" glass or not,
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the following results were obtained (# incorrect answers):
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Type of Sample Beagle NN DA
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Windows that were float processed (87) 10 12 21
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Windows that were not: (76) 19 16 22
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The study of classification of types of glass was motivated by
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criminological investigation. At the scene of the crime, the glass left
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can be used as evidence...if it is correctly identified!
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5. Number of Instances: 214
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6. Number of Attributes: 10 (including an Id#) plus the class attribute
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-- all attributes are continuously valued
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7. Attribute Information:
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1. Id number: 1 to 214
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2. RI: refractive index
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3. Na: Sodium (unit measurement: weight percent in corresponding oxide, as
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are attributes 4-10)
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4. Mg: Magnesium
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5. Al: Aluminum
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6. Si: Silicon
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7. K: Potassium
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8. Ca: Calcium
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9. Ba: Barium
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10. Fe: Iron
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11. Type of glass: (class attribute)
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-- 1 building_windows_float_processed
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-- 2 building_windows_non_float_processed
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-- 3 vehicle_windows_float_processed
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-- 4 vehicle_windows_non_float_processed (none in this database)
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-- 5 containers
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-- 6 tableware
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-- 7 headlamps
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8. Missing Attribute Values: None
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Summary Statistics:
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Attribute: Min Max Mean SD Correlation with class
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2. RI: 1.5112 1.5339 1.5184 0.0030 -0.1642
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3. Na: 10.73 17.38 13.4079 0.8166 0.5030
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4. Mg: 0 4.49 2.6845 1.4424 -0.7447
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5. Al: 0.29 3.5 1.4449 0.4993 0.5988
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6. Si: 69.81 75.41 72.6509 0.7745 0.1515
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7. K: 0 6.21 0.4971 0.6522 -0.0100
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8. Ca: 5.43 16.19 8.9570 1.4232 0.0007
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9. Ba: 0 3.15 0.1750 0.4972 0.5751
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10. Fe: 0 0.51 0.0570 0.0974 -0.1879
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9. Class Distribution: (out of 214 total instances)
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-- 163 Window glass (building windows and vehicle windows)
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-- 87 float processed
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-- 70 building windows
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-- 17 vehicle windows
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-- 76 non-float processed
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-- 76 building windows
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-- 0 vehicle windows
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-- 51 Non-window glass
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-- 13 containers
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-- 9 tableware
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-- 29 headlamps
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