immer                  package:MASS                  R Documentation

Yields from a Barley Field Trial

Description:

     The 'immer' data frame has 30 rows and 4 columns.  Five varieties
     of barley were grown in six locations in each of 1931 and 1932.

Usage:

     data(immer)

Format:

     This data frame contains the following columns:

     'Loc' The location.

     'Var' The variety of barley ('"manchuria"', '"svansota"',
          '"velvet"', '"trebi"' and '"peatland"').

     'Y1' Yield in 1931

     'Y2' Yield in 1932

Source:

     Immer, F.R., Hayes, H.D. and LeRoy Powers (1934) Statistical
     determination of barley varietal adaptation. _Journal of the
     American Society for Agronomy_ *26*, 403-407.

     Fisher, R.A. (1947) _The Design of Experiments._ 4th edition.
     Edinburgh: Oliver and Boyd.

References:

     Venables, W. N. and Ripley, B. D. (1999) _Modern Applied
     Statistics with S-PLUS._ Third Edition. Springer.

Examples:

     immer.aov <- aov(cbind(Y1,Y2) ~ Loc + Var, data = immer)
     summary(immer.aov)

     immer.aov <- aov((Y1+Y2)/2 ~ Var + Loc, data = immer)
     summary(immer.aov)
     model.tables(immer.aov, type = "means", se = TRUE, cterms = "Var")

