title: How to create a fractional factorial design in R?
body: <p>I'm struggling to create a rather elaborate fractional factorial design using R. </p>
  
  <p>(see <a href="http://en.wikipedia.org/wiki/Fractional_factorial_design" rel="noreferrer">http://en.wikipedia.org/wiki/Fractional_factorial_design</a>)</p>
  
  <p>I've searched the Google and the R-lists and have checked out several promising packages (AlgDesign, DoE.base, acepack) </p>
  
  <p>But I have not found anything thing that can handle a fractional design (only interested in main effects) with 8 factors that have either 3, 4, 6, or 11 levels each!</p>
  
  <p>Can anyone point me in the right direction?</p>
  
  <p>Thanks!</p>