Scientific Reports

Table 2 Estimation grade statistics of model 2.

From: The influence of distance weight on the inverse distance weighted method for ore-grade estimation

Variables	Grade name	Minkowski distance
Variables	Grade name	Manhattan (p = 1)	Euclidean (p = 2)	p = 3	p = 5	p = 7	p = 9	p = 11	p = 13	p = 15	p = 20	Chebyshev p → ∞
Minimum	Ni	0.017	0.020	0.020	0.038	0.039	0.059	0.052	0.059	0.059	0.059	0.059
Minimum	MgO	3.920	7.976	8.136	8.566	8.570	8.573	8.573	8.573	8.573	8.573	8.573
Maximum	Ni	0.257	0.257	0.257	0.257	0.257	0.257	0.257	0.257	0.263	0.263	0.263
Maximum	MgO	40.250	40.417	40.250	39.614	39.609	39.603	39.601	39.601	39.615	39.615	39.601
Mean	Ni	0.155	0.173	0.170	0.171	0.170	0.175	0.173	0.173	0.175	0.176	0.179
Mean	MgO	31.091	32.212	32.057	32.075	31.874	32.352	32.172	32.342	32.565	32.810	33.182
Variance	Ni	0.003	0.002	0.002	0.002	0.002	0.002	0.002	0.002	0.002	0.002	0.001
Variance	MgO	52.545	48.470	54.071	53.204	52.451	45.631	44.587	42.934	41.457	39.329	32.492
Standard deviation	Ni	0.057	0.044	0.049	0.048	0.049	0.042	0.042	0.042	0.042	0.041	0.038
Standard deviation	MgO	7.249	6.962	7.353	7.294	7.242	6.755	6.677	6.552	6.439	6.271	5.700
Medan	Ni	0.177	0.183	0.186	0.186	0.183	0.183	0.183	0.183	0.186	0.188	0.188
Medan	MgO	32.848	34.748	35.239	35.173	34.568	34.396	34.036	34.036	34.396	34.413	33.534
Kurtosis	Ni	− 0.813	− 1.060	− 1.067	− 1.060	− 1.076	− 0.960	− 0.832	− 0.846	− 0.884	− 0.864	− 0.547
Kurtosis	MgO	− 0.931	− 1.297	− 1.248	− 1.222	− 1.133	− 1.341	− 1.247	− 1.301	− 1.386	− 1.448	− 1.393
Skewness	Ni	− 0.570	0.626	0.377	0.334	0.306	0.501	0.165	0.230	0.251	0.227	− 0.777
Skewness	MgO	0.044	1.163	0.772	0.682	0.451	1.370	1.145	1.410	1.745	2.107	2.792
Variation coefficient	Ni	0.367	0.256	0.290	0.283	0.291	0.238	0.244	0.242	0.241	0.235	0.212
Variation coefficient	MgO	0.233	0.216	0.229	0.227	0.227	0.209	0.208	0.203	0.198	0.191	0.172

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