Year | Range | Mean | Variance | Standard deviation | Skewness | Kurtosis | w-testa |
---|---|---|---|---|---|---|---|
2010 | 1–5 | 2.4207 | 1.1568 | 1.0755 | 1.0787 | 1.1685 | 0.9053 |
2011 | 1–5 | 2.41 | 0.85 | 0.92 | 0.80 | 0.30 | 0.92 |
2013 | 1.17–5 | 2.85 | 0.94 | 0.97 | 0.52 | −0.29 | 0.95 |
2019 | 0–5 | 1.94 | 0.78 | 0.88 | 0.22 | −0.20 | 0.97 |
2020 | 0–5 | 2.65 | 0.75 | 0.87 | 0.04 | −0.64 | 0.96 |