[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

*Subject*: Calculating Error Estimates*From*: davidf(at)dfanning.com (David Fanning)*Date*: Tue, 14 Jul 1998 08:13:56 -0600*Newsgroups*: comp.lang.idl-pvwave*Organization*: Fanning Software Consulting*Xref*: news.doit.wisc.edu comp.lang.idl-pvwave:11517

Hi Folks, It is so hot in Colorado today that I think my brain has vapor locked. In any case, I can use some help. :-) Here is my problem. I have some experimental data. I have used CURVEFIT and my roll-your-own function to fit a curve through the data. What I want to do is display the experimental data on the plot, along with the curve. But I want to place error bars through the experimental data points. My question is this: how do I calculate the errors for the individual points so that I can place them on the plot with ERRPLOT? CURVEFIT returns to me a parameter called SIGMA, which contains the standard deviations of the returned values of the four coefficients in my fitting function. What I cannot seem to work out is how to use these standard deviations to obtain an error estimate for each individual experimental point. I realize this is basic error analysis, but even an hour spent refreshing myself with Bevington has not successfully stimulated this reptilian brain. :-( Let's just say I had too much fun on vacation... Thanks, David -- David Fanning, Ph.D. Fanning Software Consulting E-Mail: davidf@dfanning.com Phone: 970-221-0438 Coyote's Guide to IDL Programming: http://www.dfanning.com/

**Follow-Ups**:**Re: Calculating Error Estimates***From:*Heiko Hünnefeld

- Prev by Date:
**a=a(*,*,[4,1,2,3,0]) efficiency** - Next by Date:
**Re: Calculating Error Estimates** - Prev by thread:
**Re: a=a(*,*,[4,1,2,3,0]) efficiency** - Next by thread:
**Re: Calculating Error Estimates** - Index(es):