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!
data(glass)A data frame with 214 rows and 9 variables:
id number
refractive index
Sodium (unit measurement: weight percent in corresponding oxide, as are attributes 4-10)
Magnesium
Aluminium
Silicon
Potassium
Calcium
Barium
Iron
(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
From USA Forensic Science Service; 6 types of glass; defined in terms of their oxide content (i.e. Na, Fe, K, etc).