1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Goodness of fit, Residual STD, chi square

  1. Mar 24, 2016 #1
    1. The problem statement, all variables and given/known data

    I am using CasaXPS to model synthetic peak models for X-ray photoelectron spectroscopy data. I am fitting.
    The software has a lot of manuals online but they do not explain how they yield a Residual Standard Deviation, after each fit iteration. Most software use Chi-square or Reduced-Chi-squares, which I do not really understand either, but they are more widely used.
    For example,
    Whereas most softwares use Reduced Chi squares.

    Name Block Id Data Set Position FWHM Area St Dev Area %At Conc % St.Dev. Goodness of Fit
    sp2 C1s 1-1 12 284.4560 1.1348 135.671 8.38179 54.79 286.976
    sp3 C1s 1-1 285.0000 1.2000 89.8416 8.55699 36.28 286.976
    sp2-Br C1s 1-1 285.6874 1.2000 14.7421 5.73433 5.95 286.976
    C=P C1s 1-1 284.4843 0.9000 7.37342 2.8681 2.98 286.976

    I get a report in which the "Goodness of Fit" equals 286.976, how do I transform this number into something statistically significant?
    The examples they use on the manuals also happen to have high numbers for "Goodness of Fit"
    Thanks a lot.

    Attached Files:

  2. jcsd
  3. Mar 26, 2016 #2


    User Avatar
    2017 Award

    Staff: Mentor

    I think you'll have to check the manual how that property is defined.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted