R: Seed Germination Data from Crowder (1978)

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

`glmmPQL`

### Examples

    attach(seeds)

    summary(glmmPQL(cbind(r, n - r) ~ seed + extract,
            random = diag(length(r)),
            family = binomial))

[Package BradleyTerry2 version 1.0-6 Index]