title: plot multiple ROC curves for logistic regression model in R
body: <p>I have a logistic regression model (using R) as </p>
  
  <pre><code>fit6 &lt;- glm(formula = survived ~ ascore + gini + failed, data=records, family = binomial)
  summary(fit6)
  </code></pre>
  
  <p>I'm using <code>pROC</code> package to draw ROC curves and figure out AUC for 6 models fit1 through fit6. </p>
  
  <p>I have approached this way to plots one ROC.</p>
  
  <pre><code>prob6=predict(fit6,type=c("response"))
  records$prob6 = prob6
  g6 &lt;- roc(survived~prob6, data=records)
  plot(g6)
  </code></pre>
  
  <p>But is there a way I can combine the ROCs for all 6 curves in one plot and display the AUCs for all of them, and if possible the Confidence Intervals too.</p>