aphids

The data set <code>aphids</code> is a data frame with 51 rows and
2 columns. The rows correspond to 51 independent experiments
in which varying numbers of aphids were released in a flight
chamber containing 12 infected and 69 healthy tobacco plants.
The resulting number of infected plants (amongst those previously
healthy) was recorded.

datasets

Fits mixtures of (possibly multivariate) regressions
(which has been described as doing ANCOVA when you don't
know the levels). Turner (2000) <doi:10.1111/1467-9876.00198>.

Rolf Turner

mixreg

Functions to Fit Mixtures of Regressions

aphids function

The data frame <code>aphids</code> contains the following columns:<dl class="dl-horizontal">
<dt><code>aphRel</code></dt><dd>The number of aphids released in the flight chamber in
each instance.</dd>
<dt><code>plntsInf</code></dt><dd>The resulting number (out of a possible 69) of infected plants</dd></dl>

Format

After 24 hours from the time that the aphids were released, the
flight chamber was fumigated to kill the aphids, and the previously
healthy plants were moved to a greenhouse and monitored to detect
symptoms of infection. The number of plants displaying such symptoms
was recorded.

Determination of Infection Count

Data on the rate of infection of tobacco plants by a virus
spread by aphids. — aphids

The data frame <code>aphids</code> contains the following columns:<dl class='dl-horizontal'>
<dt><code>aphRel</code></dt><dd>The number of aphids released in the flight chamber in
each instance.</dd>
<dt><code>plntsInf</code></dt><dd>The resulting number (out of a possible 69) of infected plants</dd></dl>

aphids: Data on the rate of infection of tobacco plants by a virus spread by aphids.

Description

Usage

Arguments

Format

Determination of Infection Count

References