goulden.latin {agridat} | R Documentation

## Latin square experiment for testing fungicide

### Description

Latin square experiment for testing fungicide

### Usage

    data("goulden.latin")

### Format

A data frame with 25 observations on the following 4 variables.

`trt`

  treatment factor, 5 levels

`yield`

  yield

`row`

  row

`col`

  column

### Details

Five treatments were tested to control stem rust in wheat. Treatment codes and descriptions: A = Dusted before rains. B = Dusted after rains. C = Dusted once each week. D = Drifting, once each week. E = Not dusted.

### Source

Cyrus H. Goulden (1952). Methods of Statistical Analysis, 2nd ed. Page 216. http://krishikosh.egranth.ac.in/handle/1/2034118

### Examples

    data(goulden.latin)
    dat <- goulden.latin

    if(require(desplot)){
      desplot(yield ~ col*row, dat,
              text=trt, cex=1, # aspect unknown
              main="goulden.latin")
    }

    # Matches Goulden.
    m1 <- lm(yield~ trt + factor(row) + factor(col), data=dat)
    anova(m1)

[Package agridat version 1.16 Index]