orob2 R Documentation

## Germination Data

### Description

“A 2 x 2 factorial experiment comparing 2 types of seed and 2 root extracts. There are 5 or 6 replicates in each of the 4 treatment groups, and each replicate comprises a number of seeds varying between 4 and 81. The response variable is the proportion of seeds germinating in each replicate.” (Crowder, 1978, Table 3).

### Usage

data(orob2)

### Format

A data frame with 21 observations on the following 4 variables.

seed

a factor with 2 levels: O73 and O75.

root

a factor with 2 levels BEAN and CUCUMBER.

n

a numeric vector: the number of seeds exposed to germination.

y

a numeric vector: the number of seeds which actually germinated.

### References

Crowder, M.J., 1978. Beta-binomial anova for proportions. Appl. Statist. 27, 34-37.