gilmour.slatehall: Slate Hall Farm 1978

In agridat: Agricultural Datasets

Slate Hall Farm 1978

Description

Yields for a trial at Slate Hall Farm in 1978.

Format

A data frame with 150 observations on the following 5 variables.

row

row

col

column

yield

yield (grams/plot)

gen

genotype factor, 25 levels

rep

rep factor, 6 levels

Details

The trial was of spring wheat at Slate Hall Farm in 1978. The experiment was a balanced lattice with 25 varieties in 6 replicates. The 'rep' labels are arbitrary (no rep labels appeared in the source data). Each row within a rep is an incomplete block. The plot size was 1.5 meters by 4 meters.

Field width: 10 plots x 4 m = 40 m

Field length: 15 plots x 1.5 meters = 22.5 m

Source

Arthur R Gilmour and Brian R Cullis and Arunas P Verbyla (1997). Accounting for natural and extraneous variation in the analysis of field experiments. Journal of Agricultural, Biological, and Environmental Statistics, 2, 269-293. https://doi.org/10.2307/1400446

References

None.

Examples

## Not run: 

  library(agridat)
  data(gilmour.slatehall)
  dat <- gilmour.slatehall

  libs(desplot)
  desplot(dat, yield ~ col * row,
          aspect=22.5/40, num=gen, out1=rep, cex=1,
          main="gilmour.slatehall")

  # ----------------------------------------------------------------------------

  libs(asreml,lucid)

  # Model 4 of Gilmour et al 1997
  dat <- transform(dat, xf=factor(col), yf=factor(row))
  dat <- dat[order(dat$xf, dat$yf), ]
  m4 <- asreml(yield ~ gen + lin(row), data=dat,
               random = ~ dev(row) + dev(col),
               resid = ~ ar1(xf):ar1(yf))
  # coef(m4)$fixed[1] # linear row
  # [1] 31.72252 # (sign switch due to row ordering)

  vc(m4)
  ##       effect component std.error z.ratio bound 
  ##     dev(col)  2519      1959         1.3     P   0
  ##     dev(row) 20290     10260         2       P   0
  ##     xf:yf(R) 23950      4616         5.2     P   0
  ## xf:yf!xf!cor     0.439     0.113     3.9     U   0
  ## xf:yf!yf!cor     0.125     0.117     1.1     U   0
  
  plot(varioGram(m4), main="gilmour.slatehall")


## End(Not run)

agridat documentation built on Aug. 25, 2023, 5:18 p.m.