seeds {BradleyTerry2} | R Documentation |

## Seed Germination Data from Crowder (1978)

### Description

Data from Crowder(1978) giving the proportion of seeds germinated for 21 plates that were arranged according to a 2x2 factorial layout by seed variety and type of root extract.

### Usage

```
seeds
```

### Format

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

- r
the number of germinated seeds.

- n
the total number of seeds.

- seed
the seed variety.

- extract
the type of root extract.

### Source

Crowder, M. (1978) Beta-Binomial ANOVA for proportions.
*Applied Statistics*, **27**, 34–37.

### References

Breslow, N. E. and Clayton, D. G. (1993) Approximate inference
in Generalized Linear Mixed Models. *Journal of the American
Statistical Association*, **88**(421), 9–25.

### See Also

### Examples

```
summary(glmmPQL(cbind(r, n - r) ~ seed + extract,
random = diag(nrow(seeds)),
family = binomial,
data = seeds))
```

[Package

*BradleyTerry2*version 1.1-2 Index]