Table 2.
Descriptive statistics of the selected major elements found in PRD, reported on the basis of total collected dust weight (in wt%). IQR stands for interquartile range.
| Element | Mean | Median | Standard Deviation | Standard Error | Kurtosis | Skewness | Min | Max | IQR |
|---|---|---|---|---|---|---|---|---|---|
| Na | 0.20 | 0.17 | 0.09 | 0.02 | 0.57 | 1.02 | 0.05 | 0.41 | 0.09 |
| Al | 0.78 | 0.76 | 0.22 | 0.04 | 3.00 | 0.15 | 0.13 | 1.34 | 0.14 |
| P | 0.07 | 0.07 | 0.02 | 0.00 | 2.03 | -1.16 | 0.02 | 0.09 | 0.01 |
| K | 0.39 | 0.37 | 0.16 | 0.03 | 8.12 | 1.86 | 0.09 | 1.03 | 0.10 |
| Ca | 2.58 | 2.43 | 0.95 | 0.17 | 4.34 | 0.77 | 0.05 | 5.70 | 0.71 |
| Ti | 0.07 | 0.07 | 0.03 | 0.00 | 1.67 | 0.32 | 0.01 | 0.14 | 0.03 |
| Fe | 4.41 | 3.97 | 2.41 | 0.44 | 3.06 | 1.42 | 0.56 | 12.34 | 2.56 |