In an experiment, the number of seeds germination was recorded for two types of seeds and two types of root extracts
data(germ)A data frame with 21 observations on the following 4 variables.
Germthe number seeds germinating; a numeric vector
Totalthe number of seeds planted; a numeric vector
Extractthe extract type;
a factor with levels Bean and Cucumber
Seedsthe type of seed;
a factor with levels OA75
(O. aegyptiaca 75) and
OA73 (O. aegyptiaca 73)
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.
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.