coalash: Coal ash samples from a mine in Pennsylvania

Description Usage Format Note Author(s) References Examples

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

1

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

Note

data are also present in package fields, as coalash.

Author(s)

unknown; R version prepared by Edzer Pebesma; data obtained from http://homepage.divms.uiowa.edu/~dzimmer/spatialstats/, Dale Zimmerman's course page

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.

see also fields manual: http://www.image.ucar.edu/GSP/Software/Fields/fields.manual.coalashEX.Krig.shtml

Examples

1
2

Example output

       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  

gstat documentation built on March 19, 2021, 9:06 a.m.