onions data frame contains 84 sets of observations
from an experiment involving the production of white Spanish onions
in two South Australian locations.
This data frame contains the following columns:
areal density of plants (plants per square metre)
onion yield (grammes per plant).
indicator of location: 0=Purnong Landing, 1=Virginia.
Ratkowsky, D. A. (1983). Nonlinear Regression Modeling: A Unified Practical Approach. New York: Marcel Dekker.
Ruppert, D., Wand, M.P. and Carroll, R.J. (2003)
Semiparametric Regression Cambridge University Press.
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