williams.trees {agridat} | R Documentation

## Height / Survival of 37 tree species at six sites in Thailand

### Description

Height / Survival of 37 tree species at six sites in Thailand

### Format

A data frame with 222 observations on the following 4 variables.

`env`

  Environment factor, 6 levels

`gen`

  Genetic factor, 37 levels

`height`

  Height (cm)

`survival`

  Survival percentage

### Details

Planted in 1985 at six sites in Thailand. RCB with 3 reps. The data here is the mean of the three reps. Plots were 5 meters square with spacing 2m x 2m. Measurements collected at 24 months. The `gen` column in the data is actually seedlot, as some tree species have multiple seed lots. The trees are mostly acacia and eucalyptus.

### Source

Williams, ER and Luangviriyasaeng, V. 1989. Statistical analysis of tree species trial and seedlot:site interaction in Thailand. Chapter 14 of Trees for the Tropics: Growing Australian Multipurpose Trees and Shrubs in Developing Countries. Pages 145–152. http://aciar.gov.au/publication/MN010

Used with permission of Emlyn Williams.

### References

E. R. Williams and A. C. Matheson and C. E Harwood, Experimental Design and Analysis for Tree Improvement, CSIRO Publishing, 2002.

### Examples

    data(williams.trees)
    dat <- williams.trees

    require(lattice)
    xyplot(survival~height|env,dat, main="williams.trees", xlab="Height",
    ylab="Percent surviving")

[Package agridat version 1.16 Index]