| 1. Title: Glass Identification Database
| 
| 2. Sources:
|     (a) Creator: B. German
|         -- Central Research Establishment
|            Home Office Forensic Science Service
|            Aldermaston, Reading, Berkshire RG7 4PN
|     (b) Donor: Vina Spiehler, Ph.D., DABFT
|                Diagnostic Products Corporation
|                (213) 776-0180 (ext 3014)
|     (c) Date: September, 1987
| 
| 3. Past 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
| 
| 4. Relevant Information:n
|       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.
|       In determining whether the glass was a type of "float" glass or not,
|       the following results were obtained (# incorrect answers):
| 
|              Type of Sample                            Beagle   NN    DA
|              Windows that were float processed (87)     10      12    21
|              Windows that were not:            (76)     19      16    22
| 
|       The study of classification of types of glass was motivated by 
|       criminological investigation.  At the scene of the crime, the glass left
|       can be used as evidence...if it is correctly identified!
| 
| 5. Number of Instances: 214
| 
| 6. Number of Attributes: 10 (including an Id#) plus the class attribute
|    -- all attributes are continuously valued
| 
| 7. Attribute Information:
|    1. Id number: 1 to 214
|    2. RI: refractive index
|    3. Na: Sodium (unit measurement: weight percent in 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
| 
| 8. Missing Attribute Values: None
| 
| Summary Statistics:
| Attribute:   Min     Max      Mean     SD      Correlation with class
|  2. RI:       1.5112  1.5339   1.5184  0.0030  -0.1642
|  3. Na:      10.73   17.38    13.4079  0.8166   0.5030
|  4. Mg:       0       4.49     2.6845  1.4424  -0.7447
|  5. Al:       0.29    3.5      1.4449  0.4993   0.5988
|  6. Si:      69.81   75.41    72.6509  0.7745   0.1515
|  7. K:        0       6.21     0.4971  0.6522  -0.0100
|  8. Ca:       5.43   16.19     8.9570  1.4232   0.0007
|  9. Ba:       0       3.15     0.1750  0.4972   0.5751
| 10. Fe:       0       0.51     0.0570  0.0974  -0.1879
| 
| 9. 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
|
1,2,3,4,5,6,7.
id:ignore.
RI:continuous.
Na:continuous.
Mg:continuous.
Al:continuous.
Si:continuous.
K:continuous.
Ca:continuous.
Ba:continuous.
Fe:continuous.