calc.ec {eadrm}

Calculates EC50 (or some other specified EC value)

Description

Calculates the concentration that induces a response corresponding to a specific proportion between the baseline and maximum. It is most commonly used to compute EC50.

Usage

calc.ec(eadrm.obj, ec.in = 0.5, ci.obj = NULL)

Arguments

eadrm.obj

Fitted eadrm model object.

ec.in

A value between 0 and 1 corresponding to the desired proportion. Defaults to 0.5, in which case EC50 is computed.

ci.obj

Output from eadrm.ci that is used to compute confidence intervals. Defaults to NULL, in which case no confidence intervals are computed.

Value

If no confidence intervals are requested, it returns the concentration corresponding to the requested proportion. Otherwise returns a list of three values ec.med, ec.l95, and ec.u95, which correspond to the median concentration and the corresponding lower/upper 95% confidence bounds.

See Also

eadrm, eadrm.ci

Examples

ea.fit <- eadrm(CarboA$y, CarboA$x)
calc.ec(ea.fit)