germ {GLMsData}

Germination of seeds

Description

In an experiment, the number of seeds germination was recorded for two types of seeds and two types of root extracts

Usage

data(germ)

Format

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

Germ

the number seeds germinating; a numeric vector

Total

the number of seeds planted; a numeric vector

Extract

the extract type; a factor with levels Bean and Cucumber

Seeds

the type of seed; a factor with levels OA75 (O. aegyptiaca 75) and OA73 (O. aegyptiaca 73)

Details

The data gives the total number of seeds and the number germinating, for two types of seeds and two types of root stocks; the dilution is 1 in 25 in all cases.

Note

An alternative representation of these data are given in germBin.

Source

Martin J. Crowder (1978) Beta-binomial anova for proportions. Applied Statistics, 27(1), 34–37.

References

The following sources also quote the data, but have reversed the two seed types from the original source:

P. J. Smith and D. F. Heitjan (1993). Testing and adjusting for departures from nominal dispersion in generalized linear models. Applied Statistics, 42, 31–41 (Table 1).

D. J. Hand, F. Daly, A. D. Lunn, K. J. McConway, and E. Ostrowski (1994). A Handbook of Small Data Sets, London: Chapman and Hall. Dataset 420.

Examples

data(germ)
summary(germ)