+----------------+-------------------+
| Formaldehyde   | R Documentation   |
+----------------+-------------------+

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.

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

Source
~~~~~~

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

References
~~~~~~~~~~

McNeil, D. R. (1977) *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)

