title: Convert factor numeric variable to factor string in R
body: <p>I have a vector of numeric:</p>
  
  <p><code>1 3 2 4 3 3 ...</code></p>
  
  <p>I want to convert it to a vector of factor, with <code>1 = "Good"</code>, <code>2="OK"</code>, <code>"3= "Bad"</code> etc.</p>