Resolve the Fixed Lower Asymptote Value

Determines whether the lower asymptote a should be fixed based on the constraint method. Returns the fixed value (on the raw scale, before any log-transform) or NULL if a should be estimated freely.

Usage

resolve_fixed_lower_asymptote(l_asy_constraints)

Arguments

l_asy_constraints

Named list. Must contain l_asy_constraint_method and, for non-default methods, l_asy_min_constraint and/or l_asy_max_constraint. Typically an antigen_constraints object or a plain list.

Value

Numeric scalar (the fixed value on the raw scale) or NULL (parameter is free).

Details

The constraint method controls behaviour:

"default"

a is always free (returns NULL).

"user_defined"

a is fixed at l_asy_min_constraint (which should equal l_asy_max_constraint).

"range_of_blanks"

a is fixed at l_asy_min_constraint. The caller is responsible for computing this from blank data upstream.

"geometric_mean_of_blanks"

a is fixed at l_asy_min_constraint. The caller is responsible for computing this from blank data upstream.