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A data frame with 16 observations and 8 variables. The variables refer to three latent concepts: 1) ENV=environment, 2) SOIL=soil, and 3) DIV=diversity.
llll{
Num Variable Description Concept
1 env.elev Elevation (m) environment
2 env.incli Terrain inclination (degrees) environment
3 soil.ph Acidity and base saturation soil
4 soil.orgmat Organic matter content (perc) soil
5 soil.nitro Nitrogen content (perc) soil
6 div.trees Number of species of trees diversity
7 div.shrubs Numer of species of shrubs diversity
8 div.herbs Number of species of herbs diversity
}
The complete name of the rows are:
1) Abies lasiocarpa, 2) Abies concolor, 3) Pseudotsuga menziesii-Abies Concolor, 4) Pseudotsuga menziesii,
5) Pinus ponderosa-Pinus strobiformis, 6) Pinus ponderosa, 7) Pinus ponderosa-Quercus, 8) Pinus chihuahuana,
9) Pygmy conifer-oak scrub, 10) Open oak woodland, 11) Bouteloua curtipendula, 12) Spinose-suffrutescent,
13) Cercidium microphyllum, 14) Larrea divaricata, 15) Cercocarpus breviflorus, 16) Populus tremuloides.source
Mixed data from Whittaker et al (1968), and Whittaker and Niering (1975). See References below.