kerr.sugarcane.uniformity {agridat}

Uniformity trials of sugarcane, 4 fields

Description

Uniformity trials of sugarcane, 4 fields

Usage

data("kerr.sugarcane.uniformity")

Format

A data frame with 564 observations on the following 4 variables.

row

row

col

column

yield

yield, pounds per plot

trial

trial number

Details

Experiment conducted at the Sugar Experiment Station, Brisbane, Queensland, Australia in 1937.

Four trials were harvested, each 12 plots by 12 plots, each plot 19 feet by 19 feet (one field used 18-foot plots).

Trial 1 is plant cane.

Trial 2 is ratoon cane.

Trial 3 plant cane, irrigated.

Trial 4 is ratoon cane, irrigated.

Field length: 12 plots * 19 feet = 228 feet.

Field width: 12 plots * 19 feet = 228 feet.

Source

H. W. Kerr (1939). Notes on plot technique. Proc. Internat. Soc. Sugarcane Technol. 6, 764–778.

References

None

Examples

## Not run: 

library(agridat)
data(kerr.sugarcane.uniformity)
dat <- kerr.sugarcane.uniformity

# match Kerr figure 4
libs(desplot)
desplot(dat, yield ~ col*row|trial,
        flip=TRUE, aspect=1, # true aspect
        main="kerr.sugarcane.uniformity")

# CV matches Kerr table 2, page 768
# aggregate(yield ~ trial, dat, FUN= function(x) round(100*sd(x)/mean(x),2))
##   trial yield
## 1    T1  7.95
## 2    T2  9.30
## 3    T3 10.37
## 4    T4 13.76


## End(Not run)