The mesquite bushes yields dataset from Gelman and Hill (2006) (http://www.stat.columbia.edu/~gelman/arm/).
mesquite
The response variable is the total weight (in grams) of photosynthetic material as derived from actual harvesting of the bush. The predictor variables are:
diameter of the canopy (the leafy area of the bush) in meters, measured along the longer axis of the bush.
canopy diameter measured along the shorter axis.
height of the canopy.
total height of the bush.
plant unit density (# of primary stems per plant unit).
group of measurements (0 for the first group, 1 for the second group).
Gelman, Andrew, and Jennifer Hill. 2006. Data Analysis Using Regression and Multilevel/Hierarchical Models. Cambridge, UK: Cambridge University Press. tools:::Rd_expr_doi("10.1017/CBO9780511790942").