hoef {geoR} | R Documentation

## Data for spatial analysis of experiments

### Description

The `hoef` data frame has 25 rows and 5 columns.
The data consists of a uniformity trial for which artificial treatment effects were assign to the plots.

### Usage

    data(hoef)

### Format

This data frame contains the following columns:

x1
  x-coordinate of the plot.
x2
  y-coordinate of the plot.
dat
  the artificial data.
trat
  the treatment number.
ut
  the data from the uniformity trial, without the treatment effect.

### Details

The treatment effects assign to the plots are:

- Treatment 1: tau1 = 0
- Treatment 2: tau2 = -3
- Treatment 3: tau3 = -5
- Treatment 4: tau4 = 6
- Treatment 5: tau5 = 6

### Source

Ver Hoef, J.M. & Cressie, N. (1993) Spatial statistics: analysis of field experiments. In Scheiner S.M. and Gurevitch, J. (Eds) Design and Analysis of Ecological Experiments. Chapman and Hall.

### Examples

    data(hoef)
    hoef.geo <- as.geodata(hoef, covar.col=4)
    summary(hoef)
    summary(hoef.geo)
    points(hoef.geo, cex.min=2, cex.max=2, pt.div="quintiles")

[Package geoR version 1.5-7 Index]