R: Determination of Formaldehyde

Formaldehyde {datasets} | 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)

[Package datasets version 3.5.1 Index]