Higgins1990Table5 {ARTool}

Split-plot Experiment Examining Effect of Moisture and Fertilizer on Dry Matter in Peat Pots

Description

This dataset comes from a split-plot experiment examining Trays of 4 peat pots each. Moisture was varied between Trays (i.e. it was the whole-plot treatment) and Fertilizer was varied within Trays (i.e. it was the sub-plot treatment). The outcome measure was DryMatter.

Format

A data frame with 48 observations on the following 4 variables.

Tray

a factor with levels "t1" .. "t12"

Moisture

a factor with levels "m1" .. "m4"

Fertilizer

a factor with levels "f1" .. "f4"

DryMatter

a numeric vector

Details

This dataset, originally from Milliken & Johnson (1984), is reproduced here from Higgins et al. (1990).

Source

Milliken, G.A., Johnson, D.E. (1984). Analysis of Messy Data Vol I: Designed Experiments. Van Nostrand Reinhold Company, New York.

References

Higgins, J. J., Blair, R. C. and Tashtoush, S. (1990). The aligned rank transform procedure. Proceedings of the Conference on Applied Statistics in Agriculture. Manhattan, Kansas: Kansas State University, pp. 185-195.

See Also

See art for a more complete example. See also anova.art.

Examples

data(Higgins1990Table5, package = "ARTool")

## run aligned-rank transform and ANOVA on the data
m <- art(DryMatter ~ Moisture*Fertilizer + (1|Tray), data=Higgins1990Table5)
anova(m)