| % File src/library/datasets/man/Formaldehyde.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2009 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{Formaldehyde} |
| \docType{data} |
| \alias{Formaldehyde} |
| \title{Determination of Formaldehyde} |
| \description{ |
| 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. |
| } |
| \usage{Formaldehyde} |
| \format{ |
| A data frame with 6 observations on 2 variables. |
| \tabular{rlll}{ |
| [,1] \tab carb\tab numeric \tab Carbohydrate (ml) \cr |
| [,2] \tab optden \tab numeric \tab Optical Density |
| } |
| } |
| \source{ |
| Bennett, N. A. and N. L. Franklin (1954) |
| \emph{Statistical Analysis in Chemistry and the Chemical Industry}. |
| New York: Wiley. |
| } |
| \references{ |
| McNeil, D. R. (1977) \emph{Interactive Data Analysis.} |
| New York: Wiley. |
| } |
| \examples{ |
| 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) |
| } |
| \keyword{datasets} |