DOUBLE_SOFTPLUS_MODEL
=====================

Python object: ``phenotypic.schema._double_softplus_model.DOUBLE_SOFTPLUS_MODEL``

.. list-table:: Category: **DoubleSoftplus**
   :header-rows: 1

   * - Column label
     - Description
   * - ``DoubleSoftplus_v``
     - The post-lag phase growth rate.
   * - ``DoubleSoftplus_s0``
     - The initial size
   * - ``DoubleSoftplus_lambda``
     - The duration of the lag phase
   * - ``DoubleSoftplus_alpha``
     - lag phase transition sharpness
   * - ``DoubleSoftplus_smax``
     - Carrying capacity used by the model. Either the user-provided scalar or the per-group observed maximum.
   * - ``DoubleSoftplus_beta``
     - Saturation transition sharpness. Fitted per-group when a saturation shoulder is detected and ``beta`` is ``None`` at construction; held at the user-provided scalar (or the module default) when no shoulder is present.
   * - ``DoubleSoftplus_mode``
     - Fit variant selected per-group: 'fixed_beta' (beta held at the user-provided or module-default value) or 'fitted_beta' (beta fitted as a 5th free parameter when a saturation shoulder is detected).