coalash: Coal ash samples from a mine in Pennsylvania
Description
Data obtained from Gomez and Hazen (1970, Tables 19 and 20) on coal ash
for the Robena Mine Property in Greene County Pennsylvania.
Usage
data(coalash)
Arguments
Format
This data frame contains the following columns:
x
a numeric vector; x-coordinate; reference unknown
y
a numeric vector; x-coordinate; reference unknown
coalash
the target variable
References
N.A.C. Cressie, 1993, Statistics for Spatial Data,
Wiley.
Gomez, M. and Hazen, K. (1970). Evaluating sulfur and ash
distribution in coal seems by statistical response surface regression
analysis. U.S. Bureau of Mines Report RI 7377.