rameter of the <code>cxr</code> functions.</p>
<p>The effect over alpha values can likewise be ‘global’, so that, for focal species <span class="math inline">\(i\)</span>, each covariate affects the alpha values <span class="math inline">\(\alpha_{ij}\)</span> equally through a global parameter:</p>
<p><span class="math inline">\(\alpha_* + \sum_{k=1}^{s} \psi_k c_k\)</span></p>
<p>where <span class="math inline">\(*\)</span> represents the set of all pairwise interaction for a given focal species, and 