dr4pl: FindInitialParms – R documentation

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FindInitialParms

Find initial parameter estimates for a 4PL model.

FindInitialParms(x, y, trend = "auto", method.init = "Mead",
  method.robust = "squared")

`x`	Vector of dose levels
`y`	Vector of responses
`trend`	Indicator of whether the curve is a decreasing θ[3]<0 or increasing curve θ[3]>0. See `dr4pl` for detailed explanation.
`method.init`	Method of obtaining initial values of the parameters. See `dr4pl` for detailed explanation.
`method.robust`	Parameter to select loss function for the robust estimation method to be used to fit a model. See `dr4pl` for detailed explanation.

Initial parameter estimates of a 4PL model in the order of the upper asymptote, IC50, Slope and lower asymptote parameters.

Dose Response Data Analysis using the 4 Parameter Logistic (4pl) Model

v1.1.11

GPL (>= 2)

Authors

Justin T. Landis [aut, cre], Hyowon An [aut], Aubrey G. Bailey [aut], Dirk P. Dittmer [aut], James S. Marron [aut]

Initial release

2019-10-07