Dataset: coal_hhv.dat Source: A.V. Akkaya (2009). "Proximate Analysis Based Multiple Regression Models for Higher Heating Value Estimation of Low Rank Coals," Fuel Processing Technology, Vol. 90, pp. 165-170. Description: Relationship between higher heating value of coal (Y, MJ/kg) and 4 predictors: moisture, ash, volatile matter, and Fixed carbon (all wt%) for 50 samples of coal (author's analysis was based on 110 samples, of which these were the first 50). Variables/Columns Specimen ID 7-8 Moisture 12-16 Ash 20-24 Volatile Matter 28-32 Fixed Carbon 36-40 HHV 44-48