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.
get_pooled_nls_starts(data, y_var, x_var, equation_form)A named list with Q0 and alpha starting values if successful, else NULL.
The input data frame.
Name of the y-variable.
Name of the x-variable.
The equation form ("zben" or "simplified").