s used on the calibration plot and. 
for the Hosmer and Lemeshow test. Default is 10. If the range of predicted probabilities. 
is low, less than 10 groups can be chosen, but not &lt; 3.</p></dd>

</dl></div>
    <div id="details">
    <h2>Details</h2>
    <p>A typical formula object for logistic regression models has the form 
  <code>formula = Outcome ~ terms</code>. For Cox regression models the formula object must
  be defined as <code>Surv(time, status) ~ terms</code>. For Cox models calibrati