Thank you, Gtech - it was a great month. 20 years out of academia, and the cobwebs were swept away. Felt good to be in that community again. Funny thing is that I was surprised by how much I loved this kind of statistical analysis. I haven't lifted a mathematical thought since Berkeley, and even then, everything I was interested in was qualitative comparative analysis...but this quantitative stuff was a blast, rigorous modelling, all of it... Thanks for the welcome back. May we all learn something from each other. What's next? -sorry for the hijack; back to the thread...