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Pasture Regrowth after Grazing

Keywords: nonlinear regression, growth curve


The yield of pasture regrowth was measured together with the number of days since last grazing. The measurements were done on different experimental units so it is reasonable to assume the errors independent.

Variable Description

Days Days since last grazing
Yield Yield of pasture


Data File (tab-delimited text)


Ratkowsky, D. A. (1983). Nonlinear Regression Modelling. Marcel Dekker, New York.
Huet, S., Bouvier, A., Gruet, M.-A., and Jolivet, E. (1996). Statistical Tools for Nonlinear Regression. A Practical Guide with S-PLUS Examples. Springer, New York. Example 1.1.1.


The data are well fitted by a Weibull growth curve: Yield = a - b exp[ -exp{ c + d log(Days) }].



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