Mites and Wilt Disease

Data from an experiment to test whether exposure to mites protects against Wilt Disease in cotton plants.

data(Mites)

Format

A data frame with 47 observations on the following variables.

treatment

a factor with levels mites and no mites

outcome

a factor with levels wilt and no wilt

Source

Statistics for the Life Sciences, Third Edition; Myra Samuels & Jeffrey Witmer (2003), page 409.

Details

Researchers suspected that attack of a plant by one organism induced resistance to subsequent attack by a different organism. Individually potted cotton plants were randomly allocated to two groups: infestation by spider mites or no infestation. After two weeks the mites were dutifully removed by a conscientious research assistant, and both groups were inoculated with Verticillium, a fungus that causes Wilt disease. More information can be found at https://www.causeweb.org/cause/webinar/activity/2010-01/.

Examples

data(Mites)
if (require(mosaic)) {
  tally(~ treatment + outcome, data=Mites)
  tally(~ outcome | treatment, format="percent", data=Mites)
}
#>          treatment
#> outcome      mites no mites
#>   no wilt 57.69231 19.04762
#>   wilt    42.30769 80.95238