Dataset: rockstrength.csv Source: E. Ali, W. Guang, A. Ibrahim (2014). "Empirical Relations Between Compressive Strength and Microfabric Properties of Amphibolites Using Multivariate Regression, Fuzzy Inference, and Neural Networks: A Comparative Study," Engineering Geology, Vol. 183, pp. 230-240. Description: Relation between Uniaxial compressive strength (UCS) and 8 predictors: %Quartz, %Plagaoclase, %K.feldspar, %Hornblende, Grain size (mm), Grain area (mm^2), Aspect Ratio, Shape Factor for 30 rock specimens. Variable Names: sample_id UCS quartz plag kfds hb gs ga sf ar