indicating whether the asymptotic variances and confidence intervals of the survival probabilities should be calculated. Not available for all methods. More information can be found in the documentation of each method. For an alternative way to get confidence intervals, see the <code>bootstrap</code> argument.</p></dd>
<dt>conf_level</dt>
<dd><p>A number specifying the confidence level of asymptotic and/or bootstrap confidence intervals.</p></dd>
<dt>times</dt>
<dd><p>A numeric vector of time points at whic