title: Calculating row means across factor variables with strings for values
body: <p>I have four variables that consist of values: Correct/Incorrect:</p>
  
  <pre><code>Var1      Var2      Var3      Var4 
  Correct   Correct   Correct   Correct
  Incorrect Incorrect Incorrect Correct
  Incorrect Incorrect Correct   Incorrect
  Incorrect Correct   Correct   Correct
  </code></pre>
  
  <p>I was wondering if there is an easy way to calculate average scores for each row that I can assign as a new variable. Without having to actually replace Correct/Incorrect with 1/0 in the dataset. </p>
  
  <p>The score would be for correctness, so for example row1 would get a score of 1 and row4 would get a score of .75.</p>