Get Starting Values from a Pooled NLS Model (Internal Helper) — get_pooled_nls

Fits a simpler, pooled NLS model (ignoring random effects and fixed effect factors) to derive initial estimates for global Q0 and alpha parameters. These are then used as starting values for the main NLME model intercepts.

Usage

get_pooled_nls_starts(data, y_var, x_var, equation_form)

Arguments

data: The input data frame.
y_var: Name of the y-variable.
x_var: Name of the x-variable.
equation_form: The equation form ("zben" or "simplified").

Value

A named list with Q0 and alpha starting values if successful, else NULL.