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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: Determination of Formaldehyde</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for Formaldehyde {datasets}"><tr><td>Formaldehyde {datasets}</td><td style="text-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 style="text-align: right;"> [,1] </td><td style="text-align: left;"> carb</td><td style="text-align: left;"> numeric </td><td style="text-align: left;"> Carbohydrate (ml) </td> </tr> <tr> <td style="text-align: right;"> [,2] </td><td style="text-align: left;"> optden </td><td style="text-align: left;"> numeric </td><td style="text-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 <- lm(optden ~ carb, data = Formaldehyde)) summary(fm1) opar <- par(mfrow = c(2, 2), oma = c(0, 0, 1.1, 0)) plot(fm1) par(opar) </pre> <hr /><div style="text-align: center;">[Package <em>datasets</em> version 3.6.0 <a href="00Index.html">Index</a>]</div> </body></html>