logistic {bdots}

Logistic curve function for nlme

Description

Logistic function used in fitting nlme curve for observations

Usage

logistic(dat, y, time, params = NULL, ...)

Arguments

dat

subject data to be used

y

outcome variable

time

time variable

params

NULL unless user wants to specify starting parameters for gnls

...

just in case

Details

y ~ mini + (peak - mini) / (1 + exp(4 * slope * (cross - (time)) / (peak - mini)))