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)
Results
R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)
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Type 'license()' or 'licence()' for distribution details.
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Type 'contributors()' for more information and
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Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
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> library(datasets)
> png(filename="/home/ddbj/snapshot/RGM3/R_rel/result/datasets/Formaldehyde.Rd_%03d_medium.png", width=480, height=480)
> ### Name: Formaldehyde
> ### Title: Determination of Formaldehyde
> ### Aliases: Formaldehyde
> ### Keywords: datasets
>
> ### ** 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)
Call:
lm(formula = optden ~ carb, data = Formaldehyde)
Residuals:
1 2 3 4 5 6
-0.006714 0.001029 0.002771 0.007143 0.007514 -0.011743
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) 0.005086 0.007834 0.649 0.552
carb 0.876286 0.013535 64.744 3.41e-07 ***
---
Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
Residual standard error: 0.008649 on 4 degrees of freedom
Multiple R-squared: 0.999, Adjusted R-squared: 0.9988
F-statistic: 4192 on 1 and 4 DF, p-value: 3.409e-07
> opar <- par(mfrow = c(2, 2), oma = c(0, 0, 1.1, 0))
> plot(fm1)
> par(opar)
>
>
>
>
>
> dev.off()
null device
1
>