formula.nlme {nlme}R Documentation

Extract nlme Object Formula

Description

This method function extracts the nonlinear model formula associated with x.

Usage

formula(x, ...)

Arguments

x an object inheriting from class nlme, representing a fitted nonlinear mixed-effects model.
... some methods for this generic require additional arguments. None are used in this method.

Value

a two-sided nonlinear formula specifying the model used to obtain x.

Author(s)

Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu

See Also

nlme

Examples

data(Loblolly)
fm1 <- nlme(height ~ SSasymp(age, Asym, R0, lrc),
            data = Loblolly,
            fixed = Asym + R0 + lrc ~ 1,
            random = Asym ~ 1,
            start = c(Asym = 103, R0 = -8.5, lrc = -3.3))
formula(fm1)
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