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
