grass {asbio}

Agricultural factorial design

Description

Littell et al. (2006) describe an experiment to distinguish the effects of three seed growing methods on the yield of five turf grass varieties. The seed growing methods were applied to seed from each grass variety. Six pots were planted with each variety \times method combination. The pots were placed in a growth chamber with uniform conditions and dry matter (in grams) was weighed from above ground clips after four weeks.

Usage

data(grass)

Format

The dataframe has three columns:

yield

Refers to grass yield.

method

Seed growing method. A factor with three levels: a,b,c.

variety

Grass variety. A factor with five levels: 1,2,3,4,5.

Source

Littell, R. C., Milliken, G. A., Stroup, W. W., Wolfinger, R. D., and O. Schabenberger (2006) SAS for mixed models 2nd ed. SAS press.