It's All About Timing (elevated from a comment to a post by Dr H)

Because this is an important issue, and I'm afraid Andi's thoughtful summarizing of the situation will be missed where it is, I'm copying/pasting/posting it here to get your attention.  The rest of this is all from Andi.  (also, don't miss Lynn's post right below this one, which I don't want you to miss because it is so COOL!)

I agree with Elizabeth - we should quickly come to a decision; until we do, our survey and data-collecting are at a stand-still. I also agree with Isaac in that we absolutely cannot use data from two separate years. The transportation and University-usage data must be from the same year or our results will be more skewed than they would be from estimating one or the other. We have three year choices: July 1, 2008 - June 31, 2009 June 1, 2009 - May 31, 2010 July 1, 2009 - June 31, 2010 Below, I've commented on what I see as pro's and con's for each. Please let me know what you think, and let's make a decision.