Hi Gus, Thanks for your well researched and thoughtful reply. It will take a bit of time to absorb such a big and energetic doze. :) I took your earlier advice regarding the optimization flags causing errors in your case. You wrote in reply to Dave
"The optimization flags were the main cause of changes in the results, as expected." I love speed but I also want to be on the correct track. Many thanks once again. Cheers, Asad -- "Statistical thinking will one day be as necessary for efficient citizenship as the ability to read and write." - H.G. Wells
