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))