title: R: Turning a string of h:m:s to the corresponding time object
body: <p>Say I have a column in my data frame containing only objects of strings: </p>
  
  <pre><code>"00:20:10"
  "02:12:10"
  </code></pre>
  
  <p>etc</p>
  
  <p>I want to just convert these strings to the corresponding time type object (in chron library) so I can do things like calculate the mean time etc. How can I do this?</p>
  
  <p>My attempt is just do times(data column) but I get a decimal value. </p>