fit_sigmoidal: Fit a sigmoidal model to one channel

In mnirs: Muscle Near-Infrared Spectroscopy Processing and Analysis

Fit a sigmoidal model to one channel

Description

Channel fitter of analyse_logistic() (see analyse_kinetics_channels()), also the fallback of fit_sigmoidal_drift(). Self-starting SSlogistic(), SSgompertz(), or SSgompertz_left() per the channel shape via stats::nls(), with the requested direction enforced on B - A and the sign of slope (enforce_direction()).

Usage

fit_sigmoidal(x, t, valid, .a, ctx)

Arguments

x, t	Numeric vectors of the channel response and time elapsed from start_time.
valid	The find_kinetics_idx() result for the channel.
.a	The resolved argument list of the channel.
ctx	The channel context list of analyse_kinetics_channels().

Value

The coefs/model/fitted_data/diag list of build_fit_results(), or build_na_results() when the fit fails.

mnirs documentation built on Sept. 13, 2026, 1:06 a.m.