spaMM (version 1.4.1)

seeds: Seed germination data

Description

A classic toy data set, from research conducted by microbiologist Dr P. Whitney of Surrey University. A batch of tiny seeds is brushed onto a plate covered with a certain extract at a given dilution. The numbers of germinated and ungerminated seeds are subsequently counted (Crowder, 1978). Two seed types and two extracts are here considered in a 2x2 factorial design.

Usage

data(seeds)

source

Crowder (1978), Table 3.

References

Crowder, M.J., 1978. Beta-binomial anova for proportions. Appl. Statist., 27, 34-37. Y. Lee and J. A. Nelder. 1996. Hierarchical generalized linear models (with discussion). J. R. Statist. Soc. B, 58: 619-678.

Examples

data(seeds) 
## An extended quasi-likelihood (EQL) fit as considered by Lee and Nelder (1996):
HLfit(cbind(r,n-r)~seed*extract+(1|plate),family=binomial(),
  rand.family=Beta(),
  HLmethod="HL(0,0)",
  data=seeds)