agridat (version 1.12)

wassom.brome1.uniformity: Uniformity trials of bromegrass.

Description

Uniformity trials of bromegrass.

Usage

data(wassom.brome1.uniformity)

Format

A data frame with 1296 observations on the following 3 variables.

row

row

col

column

yield

yield, pounds

Details

Experiments were conducted at Ames, Iowa. The response variable is forage yield in pounds of green weight. Each plot was 3.5 x 4 feet.

There are three datasets, hereafter referred to as 'brome1', 'brome2', 'brome3'.

Brome1 was broadcast seeded, harvested in 1950.

Brome2 was row planted, harvested in 1950.

Brome3 was broadcast seeded, harvested in 1951. This field contained a mixture of alfalfa and brome in about equal proportions.

Wassom and Kalton used two different methods to estimate optimum plot size. 1. Relative efficiency of different plot sizes. 2. Regression of the log variance of yield vs log plot size.

Examples

# NOT RUN {
data(wassom.brome1.uniformity)
dat <- wassom.brome1.uniformity
desplot(yield~col*row, dat, main="wassom.brome1.uniformity", flip=TRUE)

dat <- wassom.brome2.uniformity
desplot(yield~col*row, dat, main="wassom.brome2.uniformity", flip=TRUE)

dat <- wassom.brome3.uniformity
desplot(yield~col*row, dat, main="wassom.brome3.uniformity", flip=TRUE)

# }