Changeset f9250dc in sasview for src/sas


Ignore:
Timestamp:
Jun 8, 2015 6:36:57 AM (10 years ago)
Author:
smk78
Branches:
master, ESS_GUI, ESS_GUI_Docs, ESS_GUI_batch_fitting, ESS_GUI_bumps_abstraction, ESS_GUI_iss1116, ESS_GUI_iss879, ESS_GUI_iss959, ESS_GUI_opencl, ESS_GUI_ordering, ESS_GUI_sync_sascalc, costrafo411, magnetic_scatt, release-4.1.1, release-4.1.2, release-4.2.2, release_4.0.1, ticket-1009, ticket-1094-headless, ticket-1242-2d-resolution, ticket-1243, ticket-1249, ticket885, unittest-saveload
Children:
b404a3de
Parents:
db41746
Message:

Added bookmarks to new help on Chi2 & residuals.

File:
1 edited

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  • src/sas/perspectives/fitting/media/fitting_help.rst

    r5ac0a7a rf9250dc  
    351351window, and a second graph window will appear displaying the residuals (the 
    352352difference between the experimental data and the theory) at the same X-data values. 
     353See :ref:`Assessing_Fit_Quality`. 
    353354 
    354355The objective of model-fitting is to find a *physically-plausible* model, and set 
     
    373374fit of the theory to the experimental data improves the value of 'chi2/Npts' will 
    374375decrease. A good model fit should easily produce values of 'chi2/Npts' that are 
    375 close to zero, and certainly <100. 
     376close to one, and certainly <100. See :ref:`Assessing_Fit_Quality`. 
    376377 
    377378SasView has a number of different optimisers (see the section :ref:`Fitting_Options`). 
     
    397398*Send To Fitting*. Either way, the result should be that for *n* data sets you have 
    3983992\ *n* graphs (*n* of the data and model fit, and *n* of the resulting residuals). But 
    399 it may be helpful to minimise the residuals plots for clarity. 
     400it may be helpful to minimise the residuals plots for clarity. Also see 
     401:ref:`Assessing_Fit_Quality`. 
    400402 
    401403*NB: If you need to use a customized model, you must ensure that model is available* 
     
    439441Note that the chi2/Npts value returned is the SUM of the chi2/Npts of each fit. To 
    440442see the chi2/Npts value for a specific *FitPage*, click the *Compute* button at the 
    441 bottom of that *FitPage* to recalculate. 
     443bottom of that *FitPage* to recalculate. Also see :ref:`Assessing_Fit_Quality`. 
    442444 
    443445Simultaneous Fits with Constraints 
     
    465467Note that the chi2/Npts value returned is the SUM of the chi2/Npts of each fit. To 
    466468see the chi2/Npts value for a specific *FitPage*, click the *Compute* button at the 
    467 bottom of that *FitPage* to recalculate. 
     469bottom of that *FitPage* to recalculate. Also see :ref:`Assessing_Fit_Quality`. 
    468470 
    469471.. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ 
     
    525527If you select a 'Chi2' value and click the *View Fits* button a graph of the 
    526528residuals for that data set is displayed. Again, if you select multiple 'Chi2' 
    527 values then all the residuals data will appear on one graph. 
     529values then all the residuals data will appear on one graph. Also see 
     530:ref:`Assessing_Fit_Quality`. 
    528531 
    529532Chain Fitting 
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