The outer regression (green straight lines in the chart) tracks the main trend. It save you from working out your own trend channels, BUT it does move with the price, so it is different from a static channel. You can use it as a template for drawing static channels though.
The inner regression (the curved lines) is a parabolic regression. It shows the shorter term trend within the outer trend. This helps traders to judge when it is right or wrong to take a position on the edge of the main regression, based on whether the inner regression is indicating an acceleration out of the channel, or is shaping to go with the main trend.
We find it works best if there is a clear trend. If the market is not trending, then there isn't much point using a trend analysis tool like this.
Like all indicators, it is not perfect, and you should never rely on one indicator in any situation.
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Only users authorized by the author have access to this script, and this usually requires payment. You can add the script to your favorites, but you will only be able to use it after requesting permission and obtaining it from its author — learn more here. For more details, follow the author's instructions below or contact Paul_Varcoe directly.