title: 3-level logistic regression
body: <p>I am trying to analyze a longitudinal data with binary response using 3-level logistic regression. Hierarchical structure of my data looks like this example- students (level 1) are nested within a class(level 2) and the classes are nested within a school (level 3). </p>
  
  <p>Can anyone suggest me some appropriate readings on the <code>SAS</code> or <code>R</code> codes for performing 3-level mixed effects logistic regression? I am not requesting helps regarding the theory behind 3-level logistic regression. Any examples with <code>SAS</code> or <code>R</code> codes would be of great help.  </p>