## 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.