Tat's rather complicated.that's ehy I use a simple average gradient as phil davies shows in his book''Beyond the ZO
ZONESystem'.Tha's all you needin my opinion.
The question is how much information you can extract from a limited and noisy set of data points. If advanced methods and modern computing give you results that are much more statistically sound and are therefore much more accurate and reliable, why wouldn't you want to use them? Not everybody is scared to death by math ...
Trying to be the best of whatever I am, even if what I am is no good.