Ron: The "smoothing" is simply a "rounding off" of values. Sometimes it rounds up and sometimes down depending on settings. Sort of like saying the over tension is "about" 40k lbs on a piano. That is a "smoothed" figure. It is totally impossible to derive an "exact" from that. To derive the "exact" a person would have to have all the raw data to recalculate again..... I'm sure this isn't what you wanted to hear, but that's the way it is. ;-{ John Fortiner Billings, MT. -----Original Message----- From: Ron Nossaman [mailto:rnossaman at cox.net] Sent: Sunday, May 14, 2006 12:25 PM To: Pianotech Subject: Excel trendline Brain pool - help! Excel has a trendline feature in it's charting system, to visually smooth the data. Does anyone know a way to get the set of smoothed data point values BACK from the second degree polynomial trendline routine, or how to use the trendline's Y and R^2 formulas to reconstruct the smoothed set in a column? Yes, it's piano related. Thanks, Ron N
This PTG archive page provided courtesy of Moy Piano Service, LLC