Thanks jcl.

Actually, the problem is forest vs. trees. At your trees level, what you say makes some sense. Although I don't understand your distinction between "calculating the slope of a line" and "calculates ... coefficients" - the slope is a coefficient.

In any case, at the forest level, it breaks down. An order 1 polynomial is a straight line (if you don't believe me, your 2nd link above says so ). 2 functions doing the same thing at the same polynomial order should return the same results. Imagine further that Zorro had a "LinearRegnom" function designed to take the Slope and Intercept and compute the value for any bar - like, say, polynom does. The results should be identical, and the input coefficients should be interchangeable.

But hey - it's your system - look at it whatever way you wish!

Just realize that you caused this user some confusion. If you're going to leave the functions the way they are, please at least point out in the manual the difference in time perspective, x=0 point, whatever you want to call it.

Thanks.