Coal Ash Data

SUMMARY:

The coal.ash data frame is a spatial data set with 208 rows and 3 columns: x , y and coal.

DATA DESCRIPTION:

The data frame contains the following columns:

ARGUMENTS:

x
relative x position.
y
relative y position.
coal
percent coal ash at location x, y.

The original data were obtained from Gomez and Hazen (1970, Tables 19 and 20) for the Robena Mine Property in Greene County, Pennsylvania, USA. The data come from the Pittsburgh coal seam which is associated with a deltaic sedimentation system that includes much of southwestern Pennsylvania, northeastern Ohio and northern West Virginia. Cressie (1993) has reoriented the locations so that it appears to run in an east-west and north-south direction.

SOURCE:

From Cressie (1993) who uses the data to illustrate kriging.

REFERENCES:

Cressie, Noel. (1993). Statistics For Spatial Data, Revised Edition. Wiley, New York.

Gomez, M. and Hazen, K. (1970). Evaluating sulfur and ash distribution in coal seams by statistical response surface regression analysis. U.S. Bureau of Mines Report RI 7377.