Table 4 Descriptive statistical patterns of heritage glass elements
From: Identification of ancient glass categories based on distance discriminant analysis
Glass type | Surface weathering | Chemical compositions | Average% | Median% | Standard deviation | Coefficient of variation | Skewness | Kurtosis |
|---|---|---|---|---|---|---|---|---|
High potassium glass | Unweathered | \({SiO}_{2}\) | 67.98 | 65.53 | 8.38 | 8.76 | 1.16 | 0.54 |
\({K}_{2}O\) | 9.33 | 9.83 | 3.75 | 3.92 | − 1.20 | 1.90 | ||
\(PbO\) | 0.41 | 0.16 | 0.56 | 0.59 | 1.37 | 0.42 | ||
\(BaO\) | 0.60 | 0 | 0.94 | 0.98 | 1.49 | 1.24 | ||
\(SrO\) | 0.04 | 0.02 | 0.05 | 0.05 | 0.57 | − 1.45 | ||
Weathering | \({SiO}_{2}\) | 93.96 | 93.51 | 1.58 | 1.73 | 0.85 | − 0.39 | |
\({K}_{2}O\) | 0.54 | 0.55 | 0.41 | 0.45 | − 0.54 | − 1.91 | ||
\(PbO\) | 0 | 0 | 0 | 0 | Â | Â | ||
\(BaO\) | 0 | 0 | 0 | 0 | Â | Â | ||
\(SrO\) | 0 | 0 | 0 | 0 | Â | Â | ||
Lead barium glass | Unweathered | \({SiO}_{2}\) | 54.66 | 54.61 | 11.57 | 11.83 | − 0.37 | − 0.54 |
\({K}_{2}O\) | 0.22 | 0.15 | 0.30 | 0.31 | 2.88 | 10.06 | ||
\(PbO\) | 22.08 | 20.12 | 8.03 | 8.22 | 0.62 | − 0.46 | ||
\(BaO\) | 9.00 | 8.99 | 5.70 | 5.83 | 1.80 | 3.76 | ||
\(SrO\) | 0.27 | 0.26 | 0.24 | 0.24 | 1.23 | 1.96 | ||
Weathering | \({SiO}_{2}\) | 24.91 | 25.02 | 10.40 | 10.61 | 0.31 | 1.23 | |
\({K}_{2}O\) | 0.13 | 0 | 0.24 | 0.24 | 2.51 | 7.79 | ||
\(PbO\) | 43.31 | 44.06 | 11.99 | 12.23 | − 0.03 | 0.23 | ||
\(BaO\) | 11.80 | 8.79 | 9.78 | 9.98 | 1.28 | 0.84 | ||
\(SrO\) | 0.42 | 0.43 | 0.26 | 0.26 | 0.54 | 0.78 |