Mercer and Hall wheat yield data, based on version in Cressie (1993), p. 455.
Usage
data(wheat)
Format
The format of the object generated by running data(wheat) is a three column data frame made available by Hongfei Li. The example section shows how to convert this to the object used in demonstrating the aple function, and is a:
Formal class 'SpatialPolygonsDataFrame' [package "sp"] with 5 slots;
the data slot is a data frame with 500 observations on the following 6 variables.
lat
local coordinates northings ordered north to south
yield
Mercer and Hall wheat yield data
r
rows south to north; levels in distance units of plot centres
c
columns west to east; levels in distance units of plot centres
lon
local coordinates eastings
lat1
local coordinates northings ordered south to north