a></small>
    <div class="hidden name"><code>obs_combined.Rd</code></div>
    </div>

    <div class="ref-description">
    <p>This building block declares an observation model with a combined residual error model (\(y = f + f \epsilon_1 + \epsilon_2\)).</p>
    </div>

    <pre class="usage"><span class='fu'>obs_combined</span><span class='op'>(</span><span class='va'>prediction</span>, <span class='va'>name</span>, var_prop <span class='op'>=</span> <span class='fl'>0.1</span>, var_add <span class='op'>=