Curve fitting can be quite useful in estimating values between points provided the fit is adequate. I generally make an effort to use the lowest power polynomial fit and monitor the error. If the fitting curve does not closely approach your data points then you might be in big trouble relying upon it.
I suspect that the guys at quantumheat.org are not going to use any readings that are obtained after hydrogen is introduced to the active wire to affect the curve fit. That would be a bit silly. They are now attempting to obtain the reference curve to compare the hydrogen influenced reading against. They need to be careful in this endeavor if their results are to be accepted. Dave -----Original Message----- From: James Bowery <[email protected]> To: vortex-l <[email protected]> Sent: Fri, Nov 9, 2012 4:39 pm Subject: Re: [Vo]:curve matching In the absence of Ockham's Razor, curve fitting is prone to overfitting. There is only one robust way of dealing with this problem: Kolmogorov Complexity Even when you break your data up into a test set and a data set so that you have a way of testing to see if your fit is an overfit, once you have run your test set against your model any attempt to adjust your model is now subject to the criticism that you are now taking your test set into account as part of the data set you are fitting. In practice, this criticism needn't be a show-stopper but it is ultimately problematic. On Fri, Nov 9, 2012 at 2:21 PM, Jones Beene <[email protected]> wrote: http://www.quantumheat.org/index.php/follow/109-fast-paced-progress Interesting technique seen in the second chart - curve matching using http://zunzun.com/ Any comments on this? I suppose one rationale is that if the constantan curve shows no initial anomaly - but it matches the formula up to a trigger point, and then diverges -then that adds credence. Or else if they will be looking a similar shape with a different steepness. Not sure what this curve matching adds. On the last page new data is supposedly coming in - live ! but I cannot get the page to load http://www.quantumheat.org/data/calibrations/Master_Spreadsheet11-9.xls anyone have an updated url ? Jones
