ex0817: Biological Pest Control

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

Description

In a study of the effectiveness of biological control of the exotic weed tansy ragwort, researchers manipulated the exposure to the ragwort flea beetle on 15 plots that had been planted with a high density of ragwort. Harvesting the plots the next season, they measured the average dry mass of ragwort remaining (grams/plant) and the flea beetle load (beetles/gram of ragwort dry mass) to see if the ragwort plants in plots with high flea beetle loads were smaller as a result of herbivory by the beetles.

Usage

ex0817

Format

A data frame with 15 observations on the following 2 variables.

Load

flee beetle load (in beetles/gram of ragwort dry mass)

Mass

dry mass of ragwort weed

Source

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

References

McEvoy, P. and Cox, C. (1991). Successful Biological Control of Ragwort, Senecio jacobaea, by introducing insects in Oregon, Ecological Applications 1(4): 430–442.

Examples

str(ex0817)

Example output

'data.frame':	15 obs. of  2 variables:
 $ Load: num  12.2 14.6 15.8 25.3 38.6 76.4 163 182 415 446 ...
 $ Mass: num  18.2 17.5 7.22 30.6 6.66 6.14 5.21 0.502 0.611 0.63 ...

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