agridat (version 1.23)

beaven.barley: 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

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

if (FALSE) {

library(agridat)

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
libs(desplot)
desplot(dat, yield ~ col*row,
        aspect=15/96, # true aspect
        main="beaven.barley - variety trial", text=gen)
}