l><li><p>par_1:</p><ul><li><p>For 'weibull': Shape parameter.</p></li>
<li><p>For 'lnorm': Mean of the log-transformed observations.</p></li>
<li><p>For 'exp': Rate parameter.</p></li>
</ul></li>
<li><p>'par_2':</p><ul><li><p>For 'weibull': Scale parameter.</p></li>
<li><p>For 'lnorm': Standard deviation of the log-transformed observations.</p></li>
<li><p>For 'exp': Not applicable (set to NA).</p></li>
</ul></li>
</ul></li>
<li><p>'obj_value': The value of the objective function - (negative log-likelihood)