Table 5.

Findings of exploratory factor analysis on elemental composition.

Smoky coal				Smokeless coal
Trace elements	Factor 1	Factor 2	Factor 3	Factor 1	Factor 2	Factor 3	Factor 4	Factor 5
EVs (% variance explained)	6.6 (44%)	2.5 (17%)	2.4 (16%)	5.1 (34%)	3.4 (22%)	1.8 (12%)	1.6 (10%)	1.3 (8%)
Si	0.37	−0.03	0.36	0.39	0.30	0.65	−0.06	0.33
Al	0.86	0.02	0.37	0.89	0.25	0.20	0.05	0.08
Ti	0.92	−0.09	0.30	0.90	0.34	0.17	−0.10	0.10
Fe	0.29	0.05	0.90	0.68	−0.52	0.21	0.13	0.25
Mn	−0.12	0.86	0.33	0.19	−0.26	0.40	0.47	0.27
Ca	−0.11	0.93	−0.09	0.00	0.16	0.02	0.98	0.00
Mg	0.38	0.37	0.50	0.24	0.26	0.33	0.12	0.78
Na	0.84	0.18	0.16	0.27	0.81	−0.02	0.04	0.13
K	0.83	0.08	0.33	0.46	0.54	−0.07	−0.40	0.50
P	0.77	0.20	0.29	0.78	0.25	0.22	0.12	0.23
Cr	0.76	−0.17	0.47	0.89	−0.14	0.32	−0.02	0.22
Ni	0.53	−0.03	0.55	0.43	−0.01	0.89	0.13	0.09
Sr	0.43	0.79	−0.14	0.02	0.84	0.09	0.35	0.09
Ba	0.88	0.09	0.07	0.29	0.89	0.13	−0.20	0.14
Zr	0.90	−0.09	0.36	0.90	0.37	0.21	0.00	0.06

Factor: latent variable comprising of multiple correlated variables which assists in explaining overall variance in dataset.

Variables in bold are considered to be contributory to that factor.

Factor analysis performed under varimax rotation.