Sources

1. Creator: B. German
-- Central Research Establishment
Home Office Forensic Science Service
Aldermaston, Reading, Berkshire RG7 4PN

2. Donor: Vina Spiehler, Ph.D., DABFT
Diagnostic Products Corporation
(213) 776-0180 (ext 3014)

3. Date: September 1987

Usage

• Rule Induction in Forensic Science
  - Ian W. Evett and Ernest J. Spiehler
  - Central Research Establishment
  Home Office Forensic Science Service
  Aldermaston, Reading, Berkshire RG7 4PN
  - Unknown technical note number (sorry, not listed here)
  - General Results: nearest neighbor held its own with respect to the
  rule-based system

Description

Vina conducted a comparison test of her rule-based system, BEAGLE, the nearest-neighbor algorithm, and discriminant analysis. BEAGLE is a product available through VRS Consulting, Inc.; 4676 Admiralty Way, Suite 206; Marina Del Ray, CA 90292 (213) 827-7890 and FAX: -3189. The study of the classification of types of glass was motivated by criminological investigation. At the scene of th, the glass left can be used as evidence...if it is correctly identified!

Number of Instances

214

Number of Attributes

10 (including an Id#) plus the class attribute

• all attributes are continuously valued

Attribute Information

1. Id number: 1 to 214
2. RI: refractive index
3. Na: Sodium (unit measurement: weight percent in the corresponding oxide, as
   are attributes 4-10)
4. Mg: Magnesium
5. Al: Aluminum
6. Si: Silicon
7. K: Potassium
8. Ca: Calcium
9. Ba: Barium
10. Fe: Iron
11. Type of glass: (class attribute)
    • 1 building_windows_float_processed
    • 2 building_windows_non_float_processed
    • 3 vehicle_windows_float_processed
    • 4 vehicle_windows_non_float_processed (none in this database)
    • 5 containers
    • 6 tableware
    • 7 headlamps

Missing Attribute Values:

None

Class Distribution:

(out of 214 total instances)

• 163 Window glass (building windows and vehicle windows)
  - 87 float processed
  - 70 building windows
  - 17 vehicle windows
  - 76 non-float processed
  - 76 building windows
  - 0 vehicle windows
• 51 Non-window glass
  - 13 containers
  - 9 tableware
  - 29 headlamps