Table 2.
Cross-validation statistics for grade estimation
| Cross-validation statistics or grade | |
|---|---|
| Number of estimated samples | 50 |
| Number of not estimated samples | 1 |
| Mean of actual values | 0.47404 |
| Mean of estimated values | 0.51214977 |
| Mean difference (act − est) | −0.03810977 |
| Mean difference (as % of actual) | −8.039 |
| Mean absolute difference | 0.25186146 |
| The variance of actual values | 0.1387426 |
| The variance of estimated values | 0.0871345 |
| Correlation coefficient | 0.543 |
| Kriging variance | |
| Mean of estimated KV from the model | 370.310999 |
| Mean of squared differences | 0.10781973 |
| Ratio | 3434.538 |
| Regression equation | |
| Actual | 0.12281932 + 0.68577729 × estimate |
| Standard error | 0.31267247 |