fit4plModel | R Documentation |
Method for fitting four parameter logistic models. In the fashion of this package, only binary and quantitative outcomes are supported.
fit4plModel(y, Z)
y |
Response vector. 0-1 coding for binary outcomes, otherwise conventional regression is performed. |
Z |
Numeric vector of (univariate) input samples. |
4pL models are non-linear regression models of the shape
Y = f(x, b, c, d, e) + \varepsilon = c + \frac{d-c}{1+\exp(b \cdot (x-e))} + \varepsilon
with \varepsilon being a random error term.
An object of class "4pl" which contains a numeric vector of the fitted parameters b, c, d, and e.
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