Dataset:  ohio_stratigraphy.csv

Source: R.M. Flores (1968). "Simple Linear Regression as a Means of 
Predicting the Thickness of Middle Alleghany Stratigraphical Interval
in Eastern Ohio," Journal of Sedimentary Petrology, Vol. 38, #2, pp. 400-410.

Description:
Simple linear regression and analysis of covariance with
Y = Total Thickness Middle Kittanning-Lower Freeport Interval (Feet)
X = Total Thickness Sandstone (Feet)
Facies Areas:  1= fluvio-lacustrine   2= brackish-marine
Quadrangle areas:
In Facies Area 1: Athens (1), Logan (2), New Lexington (3) Philo (4),
                  Zaleski (5), Zanesville (6)
In Facies Area 2: Alliance (7), Carrollton (8), Conesville (9),
        Coshocton (10), Dover (11), Navarre (12), Newcomerstown (13),
        Scio (14), Ulrichsville (15).
ANCOVAs fit for several quadrangles within each facies area,
    and for the 2 facies areas

Variables
Quadrangle
QuadID
faciesarea
Stratsect    /* ID for locations within quadrangles  */
Intervalthick
sandstone