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<table width="100%" summary="page for phosphor"><tr><td>phosphor</td><td align="right">R Documentation</td></tr></table>

<h2>Phosphorus Content Data</h2>

<h3>Description</h3>


<p>This dataset investigates the effect from inorganic and organic
Phosphorus in the soil upon the phosphorus content of the corn grown
in this soil, from Prescott (1975).
</p>


<h3>Usage</h3>

<pre>data(phosphor)</pre>


<h3>Format</h3>


<p>A data frame with 18 observations on the following 3 variables.
</p>

<dl>
<dt><code>inorg</code></dt><dd><p>Inorganic soil Phosphorus</p>
</dd>
<dt><code>organic</code></dt><dd><p>Organic soil Phosphorus</p>
</dd>
<dt><code>plant</code></dt><dd><p>Plant Phosphorus content</p>
</dd>
</dl>



<h3>Source</h3>


<p>P. J. Rousseeuw and A. M. Leroy (1987)
<EM>Robust Regression and Outlier Detection.</EM> Wiley, p.156, table 24.
</p>


<h3>Examples</h3>

<pre>
data(phosphor)
plot(phosphor)
summary(lm.phosphor &lt;- lm(plant ~ ., data = phosphor))
summary(lts.phosphor &lt;- ltsReg(plant ~ ., data = phosphor))

phosphor.x &lt;- data.matrix(phosphor[, 1:2])
cPh &lt;- covMcd(phosphor.x)
plot(cPh, "dd")
</pre>


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