[amibroker] Regression Channel Vs Linear Regression

["steve_almond" <steve2@xxxxxxxxxxxxxxxxxxxx>]

If I use the drawing tool "Regression Channel" I get a straight line 
(plus 2 channel lines) on my price chart extending as far as I drag 
the indicator. 
If I plot Linear Regression on the same chart, I get a curve which 
follows the price - no straight line.

Example:
Plot(LinearReg(C,52),"LR",1,1);


Questions:

1. Why are they different?
2. Using AFL, how can I replicate the straight line of the Regression 
Channel?

Thanks,

Steve





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