Description Usage Format Note Author(s) References Examples
Data obtained from Gomez and Hazen (1970, Tables 19 and 20) on coal ash for the Robena Mine Property in Greene County Pennsylvania.
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This data frame contains the following columns:
a numeric vector; x-coordinate; reference unknown
a numeric vector; x-coordinate; reference unknown
the target variable
data are also present in package fields, as coalash.
unknown; R version prepared by Edzer Pebesma; data obtained from http://www.stat.uiowa.edu/~dzimmer/spatialstats/, Dale Zimmerman's course page
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.
see also fields manual: http://www.image.ucar.edu/GSP/Software/Fields/fields.manual.coalashEX.Krig.shtml
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x y coalash
Min. : 1.000 Min. : 1.00 Min. : 7.000
1st Qu.: 5.000 1st Qu.: 8.00 1st Qu.: 8.960
Median : 7.000 Median :13.00 Median : 9.785
Mean : 7.534 Mean :12.91 Mean : 9.779
3rd Qu.:10.000 3rd Qu.:18.00 3rd Qu.:10.568
Max. :16.000 Max. :23.00 Max. :17.610
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