aphids

<p>Counts of 554 aphids of the species Sitobion avenae, sampled on 28 June 1996
in a 250 x 180-m field of winter wheat near Wimborne, Dorset, UK. The 63
sampling units, made of the inspection of five tillers each, were located on
a 9 x 7 rectangular grid at intervals of 30 m.</p>

datasets

A toolbox to make it easy to analyze plant disease epidemics. It
provides a common framework for plant disease intensity data recorded over
time and/or space. Implemented statistical methods are currently mainly
focused on spatial pattern analysis (e.g., aggregation indices, Taylor and
binary power laws, distribution fitting, SADIE and mapcomp methods). See
Madden LV, Hughes G, van den Bosch F (2007, ISBN: 978-089054-354-2) for
further information on these methods. Several data sets that were mainly
published in plant disease epidemiology literature are also included in this
package.

Christophe Gigot

epiphy

Analysis of Plant Disease Epidemics

aphids function

<p>A data frame with 63 rows and 3 variables:</p><table><tr><td>
    [, 1:2] </td>
<td> x,y   </td>
<td> Grid spatial coordinates. </td>
</tr><tr><td>
    [, 3:4] </td>
<td> xm,ym </td>
<td> Metric spatial coordonates. </td>
</tr><tr><td>
    [, 5]   </td>
<td> i     </td>
<td> Counts of aphids. </td>
</tr></table>

aphids: Counts of aphids.

Description

Usage

Arguments

Format

[, 1:2]	x,y	Grid spatial coordinates.
[, 3:4]	xm,ym	Metric spatial coordonates.
[, 5]	i	Counts of aphids.