immer {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

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**, 403–419.

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")

[Package

*MASS* version 7.2-23

Index]