Dataset: sunflower_oil1.csv

Source: J.M. Avramovic, O.S. Stamenkovic, Z.B. Todorovic, M.L. Lazic,
V.B. Veljkovic (2010). "The Optimization of the Ultrasound-Assisted
Base-Catalyzed Sunflower Oil Methanolysis by a Full Factorial Design,"
Fuel Processing Technology, Vol. 91, pp. 1551-1557.

Description: 3^3 experiment (2 replicates per treatment), relating
fatty acid methyl ester (FAME) yield to 3 factors, each at 3 levels:
Temperature: 20C (-1), 30C (0), 40C (+1)
Methanol-to-oil molar ratio: 4.5:1 (-1), 6.0:1 (0), 7.5:1 (+1)
KOH Catalyst Loading:  0.3% (-1), 0.5% (0), 0.7% (+1)

Variable Names
tempC    (Coded temperature)
mtorC    (Coded Mathanol-to-oil ratio)
kohC     (Coded KOH Catalyst level)
temp_X1  (Temperature)
mtor_X2  (Methanol-to-Oil Ratio)
koh_X3   (KOH catalyst level)
fame_Y   (FAME yield after 60 minutes)