As a few people have shown some interest in Action/Reaction lines of late, I wanted to start a thread to outline a few of the simple basics, post a few resource links, and have a suitable place for discussion.
Some years back, I followed the links on poster D Goransson's signature, one of which was the book mentioned below.
Thank you D Goransson.
Action/Reaction Models:
There are two basic models of construction for Action Reaction lines.
Both models begin with the selection of a 'Centreline'. This can be a trendline, a median line or a multi-pivot line. A historical action, or actions (depending on the model), to the left of the centreline must then be selected, and this/these are then plotted in a mirror-image fashion to the right of the centreline.
Model 1 example -
Model 2 example -
The slope can be left to right or right to left with either set.
Resources:
The two models above come from Patrick Mikula's excellent book:
The Best Trendline Methods of Alan Andrews and
Five New Trendline Techniques
This can be sourced in PDF format on Google and is free. It's an easy read and the two models above are from this book and are explained in great detail using many charts as models.
Dr Andrew's original Action Reaction course can be found here:
This is from Dr Tim Morge's website. Tim is a former student of Dr Andrews and now owns all of Andrew's original works.
An excellent short video of Tim's business partner, Shane Blankenship, explaining the relationship between trendlines, median lines and action reaction lines.
This is one of a series of videos that can be found on YouTube. They are teasers for their mentoring business, but are still well worth a look.
Median Line
One of Tim's websites - there is a wealth of free material here for anyone interested in studying Dr Andrews' work.
Finally, I've been messing around with these for a little while and got quite serious about them over the last year or so and got to a point where I wanted to post some on HotCopper.
I've been experimenting with opposing sets of A/R lines and a couple of other things, and the results have been compelling so far. This is not something that I've seen or read elsewhere, and there may be good reasons why.
