p>$$\theta_{a,b,r} = \phi * 1(a != b).$$</p>
<p>Here \(1()\) denotes de indicator function. In words, the parameter must
be the same value for any pair with different values and 0 for any
equal-valued pair.</p>
    </div>
    <div id="-oneeach-">
    <h2>'oneeach'</h2>
    

<p>Similar to <code>'onepar'</code>, parameters are 0 for equal-valued pairs and a
constant for pairs with different values, but the constant may differ
between different relative positions \(r\):</p>
<p>$$\theta{a,b,r} = \phi_r * 1(a !