ex0429 {Sleuth3}

Salvage Logging

Description

The data are the number of tree seedlings per transect in nine logged (L) and seven unlogged (U) plots affected by the Oregon Biscuit Fire, in 2004 and 2005, and the percentage of seedlings lost between 2004 and 2005. The goal is to see whether the distribution of seedlings lost differs in logged and unlogged plots.

Usage

ex0429

Format

A data frame with 16 observations on the following 5 variables.

Plot

an identification code for plot

Action

a factor with levels "L" for logged and "U" for unlogged

Seedlings2004

the number of seedlings in the plot in 2004

Seedlings2005

the number of seedlings in the plot in 2005

PercentLost

the percentage of 2004 seedlngs that were lost

Source

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

References

Donato, D.C., Fontaine, J.B., Campbell, J.L., Robinson, W.D., Kauffman, J.B., and Law, B.E. (2006). Post-Wildfire Logging Hinders Regeneration and Increases Fire Risk, Science 311: 352.

Examples

str(ex0429)