Dataset: iran_rock.csv Source: B. Mehrgini, H. Memarian, M.B. Dusseault, A. Ghavidel, M. Heydarizadeh (2016)> "Geomechanical Characteristics of Common Reservoir Caprocck in Iran (Gachsaran Formation), Experimental and Statistical Analysis," Journal of Natural Gas Science and Engineering, Vol. 34, pp. 898-907. Description: Density of samples of 8 rocks from each of 3 lovations in Iran. Locations: 1=Ghotvand, 2=Chamshir, 3=Khersan Data simulated to match mean, SD, min, max Variables: location rock.dens (kg/m^3)