

   Formaldehyde {base}                          R Documentation

   DDeetteerrmmiinnaattiioonn ooff FFoorrmmaallddeehhyyddee

   DDeessccrriippttiioonn::

        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
        sulpuric acid and the reading of the resulting purple
        color on a spectophotometer.

   UUssaaggee::

        data(Formaldehyde)

   FFoorrmmaatt::

        A data frame with 6 observations on 2 variables.

         [,1]     carb       numeric     Carbohydrate (ml)
         [,2]     optden     numeric     Optical Density

   SSoouurrccee::

        Bennett, N. A. and N. L. Franklin (1954).  Statistical
        analysis in Chemistry and the Chemical Industry.  New
        York: Wiley

   RReeffeerreenncceess::

        McNeil, D. R. (1977).  Interactive Data Analysis.  New
        York: Wiley.

   EExxaammpplleess::

        data(Formaldehyde)
        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)

