of <span class="math inline">\(P_{R}(t)\)</span> curves used to obtain the confidence intervals on the MDRI estimate, for potential further manipulation. Note that the functional form <code>cloglog_linear</code> form has two parameters (labeled <span class="math inline">\(\beta_0\)</span> and <span class="math inline">\(\beta_1\)</span>), and the <code>logit_cubic</code> form has four parameters (labeled <span class="math inline">\(\beta_0\)</span> to <span class="math inline">\(\beta_3\)</span>). In each c