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Lionel,
>A variation on Raff Regression channel is to draw a linear regression line
>and then put parallel trend lines somewhere close to the highs and lows.
>This overcomes what I consider a mathematical weakness of the Raff
>Regression Channel: if there is a bump up or down in the prices, the Raff
>Channel tends to be too wide, particularly on the oposite side to the bump.
I know, and I don't like this. I've dealt with this by drawing a trendline, through the bump, and seeing which line prices choose as their support, and going with it, at least in the short term.
Alan M.
_____________________
"Better you than me."
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