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Thank you, I take a look on this through the weekend. I'm very busy during working week....

Can you send me your email adress? My is in my profile on codeguru.

In this WEB site you can find explanation.

http://www.ruf.rice.edu/~lane/hyperstat/A115370.html

I never used Excel, so I need to know, what kind of input data you use.

Linear line regression algorithm is very easy to implement. I never use Excel SLOPE function. I suppose, that parameters are array of x,y points, the slope of a line( steepness of the line) and...