title: Use of haven to read .sav (SPSS_ files): Change labelled vector to character string or factor
body: <p>I am using the <code>haven</code> library to read an <code>.sav</code> (SPSS) file into R. </p>
  
  <p>Some of the values are read as a <code>labelled</code> <code>vector</code>. </p>
  
  <p>Here is an example of one:</p>
  
  <pre><code>&gt; str(df$instructional_practice)
  Class 'labelled'  atomic [1:4136] 2 2 6 6 8 8 NaN NaN 17 1 ...
    ..- attr(*, "label")= chr "intructional practice teacher is using when signaled"
    ..- attr(*, "format.spss")= chr "F8.2"
    ..- attr(*, "labels")= Named num [1:18] 1 2 3 4 5 6 7 8 9 10 ...
    .. ..- attr(*, "names")= chr [1:18] "1 Lecture" "2 Seatwk-Ind" "3 Review-Ind" "4 Seatwk-Grp" ...
  </code></pre>
  
  <p>How can I have the values for the <code>vector</code> be the label names?</p>