Uniformity trial of coffee in India

Uniformity trial of coffee in India in 1937

Usage

data("rau.coffee.uniformity")

Format

A data frame with 144 observations on the following 3 variables.

row

row ordinate

col

column ordinate

yield

yield per plot, pounds

Details

An experiment at the Balehonnur Coffee Experiment Station, India. An area about 2 acres in size was selected. The yields are the total of 3 pickings in 1936 and 1937.

Field length: 12 rows * 12 feet = 144 ft (each basic unit is 2 rows of trees, about 6 feet apart)

Field width: 12 column * 30 feet = 360 ft (each basic unit is 5 trees, about 6 feet apart)

Note: Rau does not specify exactly which ordinate of the plots in Table 1 has 2 trees and which ordinate has 5 trees, but given the shape of Table 1 (much wider than tall) and the logical arrangement of data, we believe we have the dimensions correct.

Transcription details: An iPhone was used to capture the text in Table 1, page 82, which was then manually corrected by K.Wright 2025.08.13.

Source

Rau, A. Ananthapadmanabha (1940). Experimental Methods in Coffee. The Journal of the Mysore Agricultural & Experimental Union, 19, 76-89. https://archive.org/details/mysore-agricultural_october-december-1940_19_2

References

None

Examples

if (FALSE) { # \dontrun{
library(agridat)
data(rau.coffee.uniformity)
dat <- rau.coffee.uniformity

library(desplot)
desplot(dat, yield~col*row,
        aspect=144/360, # probably true aspect
        flip=TRUE, main="rau.coffee.uniformity")
mean(dat$yield) # matches 27.24 in Rau
} # }