> are allowed. Must be a factor variable.</p></li>
<li><p><strong>Approximate Variance:</strong> Calculations to approximate the variance and confidence intervals are not available. Bootstrap confidence intervals can however be calculated with all supported models. See <code><a href="adjustedsurv.html">?adjustedsurv</a></code> for more information on bootstrapping.</p></li>
<li><p><strong>Allowed Time Values:</strong> Allows both continuous and integer time.</p></li>
<li><p><strong>Bounded Estimates:</stron