agridat (version 1.23)

devries.pine: Graeco-Latin Square experiment in pine

Description

Graeco-Latin Square experiment in pine

Usage

data("devries.pine")

Format

A data frame with 36 observations on the following 6 variables.

block

block

row

row

col

column

spacing

spacing treatment

thinning

thinning treatment

volume

stem volume in m^3/ha

growth

annual stem volume increment m^3/ha at age 11

Details

Experiment conducted on Caribbean Pine at Coebiti in Surinam (Long 55 28 30 W, Lat 5 18 5 N). Land was cleared in Jan 1965 and planted May 1965. Each experimental plot was 60m x 60m. Roads 10 m wide run between the rows. Each block is thus 180m wide and 200m deep. Data were collected only on 40m x 40m plots in the center of each experimental unit. Plots were thinned in 1972 and 1975. The two treatment factors (spacing, thinning) were assigned in a Graeco-Latin Square design.

Spacing: A=2.5, B=3, C=3.5. Thinning: Z=low, M=medium, S=heavy.

Field width: 4 blocks x 180 m = 720 m

Field length: 1 block x 200 m = 200 m.

References

None

Examples

if (FALSE) {

  library(agridat)
  data(devries.pine)
  dat <- devries.pine

  libs(desplot)
  desplot(dat, volume ~ col*row,
          main="devries.pine - expt design and tree volume",
          col=spacing, num=thinning, cex=1, out1=block, aspect=200/720)
  
  libs(HH)
  HH::interaction2wt(volume ~ spacing+thinning, dat,
                     main="devries.pine")

  # ANOVA matches appendix 5 of DeVries
  m1 <- aov(volume ~ block + spacing + thinning + block:factor(row) +
              block:factor(col), data=dat)
  anova(m1)

}