Thanks for the reply Roki, I have to admit i am not a trained statition, but i have found myself dabbling in it further and further until i have a hugely complex model.

With regards to each variable, I do review every variable individually by correlation and some are definitely related the r-square values are relatively high as i apply the best order polynomial relationship. I have enough data to assume that any trends are no mistake. In retrospect i should probably running something like this in Matlab, however it started off as my producing some graphs. But now it is a full scale model. I currently have a dedicated PC for running solver for days at a time, to produce the correct results.

Whats your background Roki?

Alan