sis used to represent the smooth term. The default depends on the number of variables that the smooth is a function of. Default=-1. For more information see the description of the parameter 'k' in https://stat.ethz.ch/R-manual/R-devel/library/mgcv/html/s.html.</p></dd>


<dt id="arg-gam-method">gam_method<a class="anchor" aria-label="anchor" href="#arg-gam-method"></a></dt>
<dd><p>String indicating the smoothing parameter estimation method. Default="GCV.Cp". Available strings are 'GCV.Cp', 'GACV.Cp', 'R