Thanks for that enlightenment Woof. I at least know most of the terms even if I haven't used them the way you have. I think with the aid of the statistics book I've got out of the library at the moment I may be able to grasp it and there may be some gold at the end of it.

Thanks to Stugs and Partypooper too. Your comments were the best laugh I've had for a long time.

KV