agridat (version 1.5)

immer.sugarbeet: Uniformity study of sugarbeets with measurements of yield, sugar, purity

Description

A uniformity study of sugarbeets.

Usage

data(immer.sugarbeet)

source

F. R. Immer. 1932. Size and shape of plot in relation to field experiments with sugar beets. Jour. Agr. Research, 44, 649--668.

Details

Planted in 1930. Field conditions were uniform. Beets were planted in rows 22 inches apart. After thinning, one beet was left in each 12-inch unit. At harvest, the field was marked out in plot 33 feet long, with a 2-foot alley between plots to minimize carrover from the harvester. A sample of 10 beets was taken uniformly (approximately every third beet) and measured for sugar percentage and apparent purity. The beets were counted at weighing time and the yields were calculated on the basis of 33 beets per plot. Immer found that aggregating the data from one row to two resulted in a dramatic reduction in the standard error (for yield).

Examples

dat <- immer.sugarbeet

# Immer numbers rows from the top
desplot(yield~col*row, data=dat, tick=TRUE, flip=TRUE)
desplot(sugar~col*row, data=dat, tick=TRUE, flip=TRUE)
desplot(yield~col*row, data=dat, tick=TRUE, flip=TRUE)
pairs(dat[,c('yield','sugar','purity')])