Re: [Phys-l] heat loads

[Brian Whatcott <betwys1@sbcglobal.net>]

At 06:16 PM 2/18/2006, you wrote:
> another "law":  Newton's law of cooling.
>
> 2) There is a body of opinion that prefers not to massage data
> in order to run a straight line through it.
>   The least squares fit exaggerates the weight of the cool end.
> Better in my view to run a non linear lms fit.
>
>
> This seems much work.  I prefer to massage by using my calibrated
> outlier removal judgment.
> The first reference I found suggested least trimmed squares might be better?
>
> bc, eliminates outliers one by one until happy.
>
> p.s. got any suggested programs for power mac?

We all have our sweet heart procedures. Mine is NLREG.
It's not high cost. Versions for PC of course, and I think, mac too.
You write the target equation.    You provide the list of x & y values.
The program sizes the parameters provided, and shows the expected
 normal  distribution of the errors. Outliers are easy to pick up.
It supports its results with statistics.



Brian Whatcott    Altus OK    Eureka!