-                      r63d314b
+                      rb5846a10
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+.. _Adding_your_own_models:
 Adding your own models
 ----------------------
 …
 fit parameters between data sets (eg, to fix a background level, or radius, etc).
+If the data to be fit are in multiple files, load each file, select it in the
+*Data Explorer*, and *Send To Fitting*.
+If multiple data sets are in one file, load that file, *Unselect All Data*, then
+select each dataset one at a time and Send To Fitting.
+The result should be that for
+n
+datsets you have 2
+n
+graphs (
+n
+of the data & model fit and
+n
+residuals plots).
+IMPORTANT!
+If you need to create a n
+ew model with the new model wizard, or use a
+model which is the sum of two existing models, go Fitting
+Edit Custom Model
+before
+sending the data to the fitting engine.
+The model will be available under
+Customised
+Models
+on
+the FitPage. NB: the name will likely be abbreviated; eg,
+Peak
+Gauss
+Model + Absolute Power Law Model
+will appear as
+PGM + APL
+.
+.
+Go to each Fit
+Page in turn
+and:
+Select the required model.
+Unselect all the model par
+ameters.
+Enter some starting guesses for the parameters (it may be helpful to remove the
+residuals plots for clarity; go Graph
+Show and untick graph windows as required).
+Enter any parameter limits (recommended).
+Select which parameters will refine (sele
+cting all is probably a bad idea...).
+.
+Select Fitting
+Simultaneous Fit (this also selects the Complex Fit Engine).
+.
+Go to the Simultaneous Fit page
+and:
+Select which datasets are to be fitted (which will probably be all of them or you wouldnt
+have
+loaded them in!).
+It is possible to tie parameters between datasets with constraints; eg, make the
+Background in FitPage1 the same as the Background in FitPage2, and so on. To do this,
+answer yes to Add Constraints in the Fit Constraints box.
+But note th
+at SANSView only lets you constrain parameters that are refining.
+.
+Click Fit
+If the data to be fit are in multiple files, load each file, then select each file
+in the *Data Explorer*, and *Send To Fitting*. If multiple data sets are in one file,
+load that file, *Unselect All Data*, select just those data sets to be fitted, and
+*Send To Fitting*. Either way, the result should be that for *n* data sets you have
+*n* graphs (*n* of the data and model fit, and *n* of the resulting residuals). But
+it may be helpful to minimise the residuals plots for clarity.
+*NB: If you need to use a customized model, you must ensure that model is available*
+*first (see* :ref:`Adding_your_own_models` *).*
+Now go to each *FitPage* in turn and:
+  Select the required category and model;
+  Unselect all the model parameters;
+  Enter some starting guesses for the parameters;
+  Enter any parameter limits (recommended);
+  Select which parameters will refine (selecting all is generally a bad idea...);
+When done, select *Constrained or Simultaneous Fit* under *Fitting* in the menu bar.
+In the *Const & Simul Fit* page that appears, select which data sets are to be
+simultaneously fitted (this will probably be all of them or you would not have loaded
+them in the first place!).
+To tie parameters between the data sets with constraints, check the 'yes' radio button
+next to *Add Constraint?* in the *Fit Constraints* box.
+*NB: You can only constrain parameters that are set to refine.*
+When ready, click the *Fit* button on the *Const & Simul Fit* page, NOT the *Fit*
+button on the individual *FitPage*'s.
 Simultaneous Fits without Constraints
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Assuming some FitPages are already set up, check the checkboxes of the
+model_data rows to fit. And click the 'Fit' button. The results will return to
+each FitPages.
+Note that the chi2/Npts returned is the sum of the chi2/Npts of each fits. If
+one needs the chi2 value only for a page, click the 'Compute' button in the
+FitPage to recalculate.
+The results of the model-fitting will be returned to each of the individual
+*FitPage*'s.
+Note that the chi2/Npts value returned is the SUM of the chi2/Npts of each fit. To
+the chi2/Npts value for a specific *FitPage*, click the *Compute* button at the
+bottom of that *FitPage* to recalculate.
 Simultaneous Fits with Constraints
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Enter constraint in the text control next to *constraint fit*  button.
+Constraint should be of type model1 parameter name = f(model2 parameter name)
+for example, M0.radius=2*M1.radius. Many constraints can be entered for a
+single fit. Each of them should be separated by a newline charater or ";"
+The easy setup can generate many constraint inputs easily when the selected
+two models are the same type.
+Note that the chi2/Npts returned is the sum of the chi2/Npts of each fits.
+If one needs the chi2 value only for one fit, click the 'Compute' button in
+the FitPage to recalculate.
+Use the *Easy Setup* drop-down buttons in the *Const & Simul Fit* page to set
+up constraints between *FitPage*'s.
+Constraints will generally be of the form Mi Parameter1 = Mj.Parameter1, however
+the text box after the '=' sign can be used to adjust this relationship; for
+example Mi Parameter1 = scalar*Mj.Parameter1. A 'free-form' constraint box is
+also provided.
+Many constraints can be entered for a single fit.
+The results of the model-fitting will be returned to each of the individual
+*FitPage*'s.
+Note that the chi2/Npts value returned is the SUM of the chi2/Npts of each fit. To
+the chi2/Npts value for a specific *FitPage*, click the *Compute* button at the
+bottom of that *FitPage* to recalculate.
 .. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ

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

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