fish {EngrExpt}

Toxin concentrations in fish by site

Description

Toxin concentrations in fish by site

Format

fish is a data frame with 16 observations on the following 2 variables.

site

a factor with levels A, B, C and D

toxin

a numeric vector

fish2 is a data frame with 16 observations on the following 2 variables.

site

a factor with levels E, F, G and H

toxin

a numeric vector

Details

Prior to beginning mining operations a new precious metals mine had to run an extensive environmental study of the surrounding area, particularly down stream from their construction site. Thus, a baseline of data was collected over many years so that any environmental impact of the facility could be quantified. One step in the study was to collect fish along a stream and measure the amount of various toxins found in the fish.

References

Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)

Examples

str(fish)
dotplot(reorder(site, toxin) ~ toxin, fish, jitter.y = TRUE,
        aspect = 0.3, xlab = "Amount of toxin (mg/kg wet weight)")
str(fish2)
dotplot(reorder(site, toxin) ~ toxin, fish2, jitter.y = TRUE,
        aspect = 0.3, xlab = "Amount of toxin (mg/kg wet weight)")