LinRegSlopePlus indicator exponential calculation

[algotrade]

Hello, please would like to understand how is the LinRegSlopePlus calculation done when the exponential option is set to true.
Looking for some reference on the internet, I found something on Exponential Regresion:

http://www.zweigmedia.com/RealWorld/calctopic1/regression.html

I am not sure if this is the approach that is used on this indicator, and I couldn`t find any reference on the indicator and the techniques that are used.

I guess the confusion is because an exponential regression would be a non-linear function, so an exponential linear regression would be nonsense.

Thank you very much.

[NinjaTrader_Bertrand]

algotrade, you might want to PM the original author to explain potentially in more detail - what I can see as explanation resides as comment in the source file -

'This function calculates a linear regression slope using exponential
moving averages as the summation terms in the slope formula. A
simple average multiplied by the number of elements equals the sum,
so we can calcuate the regression slope using simple averages.
However, if we replace the simple averages in the computation by
exponential averages, the resulting slope magnitude turns out larger
by a factor of 3N/(N+1), where N is the number of elements, therefore
we must divide the result by this correction factor (this simple
correction was actually a lot of work to figure out).

The correction factor will give perfect results for regions of
perfectly constant slopes, but for noisy data like markets, the
response time of the exponential average will make the SWINGS in
slope magnitude appear smaller than the actual regression slope,
although the slope will be smoother in areas of fairly constant slope.'