 TRUE a calibration plot is generated. Default is TRUE. 
model_type must be "binomial".</p></dd>


<dt>plot.method</dt>
<dd><p>If "mean" one calibration plot is generated, first taking the 
mean of the linear predictor across the multiply imputed datasets (default), if 
"individual" the calibration plot of each imputed dataset is plotted, 
if "overlay" calibration plots from each imputed datasets are plotted in one figure.</p></dd>


<dt>groups_cal</dt>
<dd><p>A numerical scalar. Number of group