beaven.barley {agridat} | R Documentation

## Yields of 8 barley varieties in 1913 as used by Student.

### Description

Yields of 8 barley varieties in 1913.

### Usage

    data("beaven.barley")

### Format

A data frame with 160 observations on the following 4 variables.

`row`

  row

`col`

  column

`gen`

  genotype

`yield`

  yield (grams)

### Details

Eight races of barley were grown on a regular pattern of plots.

These data were prepared from Richey (1926) because the text was cleaner.

Each plot was planted 40 inches on a side, but only the middle square 36 inches on a side was harvested.

Field width: 32 plots * 3 feet = 96 feet

Field length: 5 plots * 3 feet = 15 feet

### Source

Student. (1923). On testing varieties of cereals. Biometrika, 271-293.

http://doi.org/10.1093/biomet/15.3-4.271

### References

Frederick D. Richey (1926). The moving average as a basis for measuring correlated variation in agronomic experiments. Jour. Agr. Research, 32, 1161-1175.

### Examples

    data(beaven.barley)
    dat <- beaven.barley

    # Match the means shown in Richey table IV
    tapply(dat$yield, dat$gen, mean)
    ##       a       b       c       d       e       f       g       h
    ## 298.080 300.710 318.685 295.260 306.410 276.475 304.605 271.820

    # Compare to Student 1923, diagram I,II
    if(require(desplot)){
      desplot(yield ~ col*row, data=dat,
              aspect=15/96, # true aspect
              main="beaven.barley - variety trial", text=gen)
    }

[Package agridat version 1.16 Index]