Description

The data gives the proportion of leaf area affected by leaf blotch on 10 varieties of barley at 9 different sites.

Usage

Format

A data frame with 90 observations on the following 3 variables.

blotch

proportion of the barley leaf affected by blotch

site

the physical location - a factor with levels 1 2 3 4 5 6 7 8 9

variety

variety of barley - a factor with levels 1 2 3 4 5 6 7 8 9 10

Source

R. W. M. Wedderburn (1974) "Quasilikelihood functions, generalized linear models and the Gauss-Newton method" Biometrika, 61, 439-447.

References

P. McCullagh and J. Nelder (1989) "Generalized Linear Models" Chapman and Hall, 2nd ed.