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

<h2>Determination of Formaldehyde</h2>

<h3>Description</h3>


<p>These data are from a chemical experiment to prepare a standard curve
for the determination of formaldehyde by the addition of chromatropic
acid and concentrated sulphuric acid and the reading of the resulting
purple color on a spectrophotometer.
</p>


<h3>Usage</h3>

<pre>Formaldehyde</pre>


<h3>Format</h3>


<p>A data frame with 6 observations on 2 variables.
</p>

<table summary="Rd table">
<tr>
 <td align="right">
    [,1] </td><td align="left"> carb</td><td align="left"> numeric </td><td align="left"> Carbohydrate (ml) </td>
</tr>
<tr>
 <td align="right">
    [,2] </td><td align="left"> optden </td><td align="left"> numeric </td><td align="left"> Optical Density
  </td>
</tr>

</table>



<h3>Source</h3>


<p>Bennett, N. A. and N. L. Franklin (1954)
<EM>Statistical Analysis in Chemistry and the Chemical Industry</EM>.
New York: Wiley.
</p>


<h3>References</h3>


<p>McNeil, D. R. (1977) <EM>Interactive Data Analysis.</EM>
New York: Wiley.
</p>


<h3>Examples</h3>

<pre>
require(stats); require(graphics)
plot(optden ~ carb, data = Formaldehyde,
     xlab = "Carbohydrate (ml)", ylab = "Optical Density",
     main = "Formaldehyde data", col = 4, las = 1)
abline(fm1 &lt;- lm(optden ~ carb, data = Formaldehyde))
summary(fm1)
opar &lt;- par(mfrow = c(2,2), oma = c(0, 0, 1.1, 0))
plot(fm1)
par(opar)
</pre>


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