title: How to remove ordering of the levels from factor variable in R?
body: <p>The title says it all, I ordered a factor variable when I generated it, now I would like to remove the ordering and use it as an unordered factor variable. 
  And another question, if I use my factor variable as a predictor in a regression does it make a difference to R if it is ordered (ordinal) or simple factor variable (categorical)?</p>