Contains measurements 214 observations of 6 types of glass; defined in terms of their oxide content.
Type has 6 types of glasses
X1 refractive index
X2 Sodium (unit measurement: weight percent in corresponding oxide).
X3 Magnesium
X4 Aluminum
X5 Silicon
X6 Potassium
X7 Calcium
X8 Barium
X9 Iron
Usage
data(glass)