R: Data for spatial analysis of experiments

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

    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 1.7-5.2 Index]