gomez.groupsplit {agridat} | R Documentation

## Group balanced split-plot design in rice

### Description

Group balanced split-plot design in rice

### Format

A data frame with 270 observations on the following 7 variables.

`col`

  column

`row`

  row

`rep`

  replicate factor, 3 levels

`fert`

  fertilizer factor, 2 levels

`gen`

  genotype factor, 45 levels

`group`

  grouping (genotype) factor, 3 levels

`yield`

  yield of rice

### Details

Genotype group S1 is less than 105 days growth duration, S2 is 105-115 days growth duration, S3 is more than 115 days.

### Source

Gomez, K.A. and Gomez, A.A.. 1984, Statistical Procedures for Agricultural Research. Wiley-Interscience. Page 120.

Used with permission of Kwanchai Gomez.

### Examples

    data(gomez.groupsplit)
    dat <- gomez.groupsplit

    # Gomez figure 3.10.  Obvious fert and group effects
    if(require(desplot)){
      desplot(group ~ col*row, dat,
              out1=rep, col=fert, text=gen, # aspect unknown
              main="gomez.groupsplit")
    }

    # Gomez table 3.19 (not partitioned by group)
    m1 <- aov(yield ~ fert*group + gen:group + fert:gen:group +
                Error(rep/fert/group), data=dat)
    summary(m1)

[Package agridat version 1.16 Index]