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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Potency of two herbicides</title>
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</head><body><div class="container">
<table width="100%" summary="page for S.alba"><tr><td>S.alba</td><td style="text-align: right;">R Documentation</td></tr></table>
<h2>Potency of two herbicides</h2>
<h3>Description</h3>
<p>Data are from an experiment, comparing the potency of the two herbicides glyphosate and bentazone in
white mustard <em>Sinapis alba</em>.
</p>
<h3>Usage</h3>
<pre>data(S.alba)</pre>
<h3>Format</h3>
<p>A data frame with 68 observations on the following 3 variables.
</p>
<dl>
<dt><code>Dose</code></dt><dd><p>a numeric vector containing the dose in g/ha.</p>
</dd>
<dt><code>Herbicide</code></dt><dd><p>a factor with levels <code>Bentazone</code> <code>Glyphosate</code> (the two herbicides applied).</p>
</dd>
<dt><code>DryMatter</code></dt><dd><p>a numeric vector containing the response (dry matter in g/pot).</p>
</dd>
</dl>
<h3>Details</h3>
<p>The lower and upper limits for the two herbicides can be assumed identical, whereas slopes and ED50 values
are different (in the log-logistic model).
</p>
<h3>Source</h3>
<p>Christensen, M. G. and Teicher, H. B., and Streibig, J. C. (2003) Linking fluorescence
induction curve and biomass in herbicide screening, <em>Pest Management Science</em>,
<b>59</b>, 1303–1310.
</p>
<h3>See Also</h3>
<p>See the examples sections for <code>drm</code> and <code>EDcomp</code>.
</p>
<h3>Examples</h3>
<pre>
## Fitting a log-logistic model with
## common lower and upper limits
S.alba.LL.4.1 <- drm(DryMatter~Dose, Herbicide, data=S.alba, fct = LL.4(),
pmodels=data.frame(Herbicide,1,1,Herbicide))
summary(S.alba.LL.4.1)
## Applying the optimal transform-both-sides Box-Cox transformation
## (using the initial model fit)
S.alba.LL.4.2 <- boxcox(S.alba.LL.4.1, method = "anova")
summary(S.alba.LL.4.2)
## Plotting fitted regression curves together with the data
plot(S.alba.LL.4.2)
</pre>
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