ex1014: Toxic Effects of Copper and Zinc

In Sleuth3: Data Sets from Ramsey and Schafer's "Statistical Sleuth (3rd Ed)"

Description

Researchers randomly allocated 25 beakers containing minnow larvae to receive one of 25 treatment combinations of 5 levels of zinc and 5 levels of copper.

Usage

ex1014

Format

A data frame with 25 observations on the following 3 variables.

Copper

amount of copper received (in ppm)

Zinc

amount of zinc received (in ppm)

Protein

protein in minnow larvae exposed to copper and zinc (mug/larva)

Source

Ramsey, F.L. and Schafer, D.W. (2013). The Statistical Sleuth: A Course in Methods of Data Analysis (3rd ed), Cengage Learning.

References

Ryan, D.A., Hubert, J.J., Carter, E.M., Sprague, J.B. and Parrott, J. (1992). A Reduced-Rank Multivariate Regression Approach to Aquatic Joint Toxicity Experiments, Biometrics 48(1): 155–162.

Examples

str(ex1014)

Example output

'data.frame':	25 obs. of  3 variables:
 $ Copper : int  0 0 0 0 0 38 38 38 38 38 ...
 $ Zinc   : int  0 375 750 1125 1500 0 375 750 1125 1500 ...
 $ Protein: int  201 186 173 110 115 202 161 172 138 133 ...

Sleuth3 documentation built on May 2, 2019, 6:41 a.m.