The
iron.ore
data frame is a spatial data set with 112 rows
and 4 columns:
easting
,
northing
,
ore
, and
residuals
.
The data frame contains the following columns:
easting
,
northing
.
The modified data appear in Cressie (1986) and also in Zimmerman and Zimmerman (1991).
Cressie, Noel. (1986).
Kriging nonstationary data.
Journal American Statistical Association,
81, 625-634.
Zimmerman, Dale L. and Zimmerman, M. Bridget. (1991).
A comparison of spatial semivariogram estimators and corresponding ordinary
kriging predictors.
Technometrics,
33, 77-91.