Metrohm Vision Manual - Manual (Page 132)

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sets. You can type in the constituent values, and move samples between sets as described
above.
3. Choose Select/Save Results to save the results of the sample selection. If the Validation or
Outlier set contained any spectra, you will have an option to save them for validation
purposes.
Creating Multiple Sample Selection Methods
A newly-created Sample Selection method may be tested, without losing the result of the previous
trial. In order to do this:
1. Click on Select/New Method. All graphs will reset.
2. Follow the standard sample selection procedure.
3. The results of previous sample selection methods can be viewed by choosing the proper
method screen from the Window submenu.
4. If multiple sample selection methods were attempted, make sure that the method you want
to save is in the active window before saving. If necessary, switch to the proper method.
If the user attempts to create a new product before the created temporary set undergoes sample
selection, a multiple choice window will be displayed. The user can select to proceed with previous
product sample selection, save all samples from the temporary set to the training set, or empty the
temporary set.
After saving the sample selection results, the equation icon changes from a gray cuvette symbol to a
question mark. This signifies that the calibration set is ready for equation development.
5.3 Creating custom equations
Vision allows creation of a one-term MLR equation with manually entered bias and slope. Custom
equations can be created in Quantitative Sample Selection. To create a custom equation:
1. Follow sample selection procedure to a temporary set stage.
2. Click on Select/Create Custom Equation.
3. From the Custom Equation Parameters dialog box, select wavelength, slope, bias, and math
pretreatment.