Baseline and Peak Analysis

Origin offers several tools for analyzing peak data with or without a baseline.

Pick Peaks Tool

The Pick Peaks tool can be used for basic peak analysis. Its abilities are restricted to locating the peak heights and centers of both positive and negative peaks. More...

Baseline Tool

The Baseline Tool is a slightly more general tool. Three tabs allow you to generate a baseline, detect postive and negative peaks, report peak parameters, and calculate the area under the whole curve or each individual peak. More...

Nonlinear Least Squares Fitter and the NLSF Wizard

The Nonlinear Least Squares Fitter (NLSF) and the NLSF Wizard are both general nonlinear regression tools which include the ability to fit multiple peak data. For one peak, both the NLSF and NLSF Wizard provide automatic parameter initialization. However, in a multiple peak fit, the NLSF requires manual parameter initialization while the NLSF Wizard offers graphical peak initialization. If you want to fit more than one multiple peak dataset simultaneously, or want more control over the fit, the NLSF is the tool to use.

In both the NLSF and NLSF Wizard the following peak fitting options are available:

• Choose from more than 15 peak functions (nearly 200 functions overall) or define your own peak function.*
• Include confidence and prediction bands in the graph during and after fitting.
• Create residuals plots.
• Create a worksheet which contains a broad range fitting results, including final parameter values, errors, confidence limits, etc.
• Much more!

There are also preprogrammed single and multiple, Gaussian and Lorentzian, peak fitting routines included in Origin's Analysis menu. Since these routines run the NLSF in the background, they can be used to quickly initialize a fit, which you can then fine tune in the NLSF. More about the NLSF... | More about the NLSF Wizard...

* Multiple peak datasets can be fit to user-defined peak functions provided the function itself is defined to handle each peak (replica).

Peak Fitting Module (PFM)

If you need more advanced peak analysis, consider the Peak Fitting Module (PFM). The PFM allows you to automatically detect a baseline and fit over 100 peaks. If your peak dataset contains more than one peak type, separate fitting functions can be used to fit each individual peak. Furthermore, an extensive set of built-in functions is provided, as well as the ability to create your own user-defined functions with arbitrary baselines. Once the fitting process is complete, the wizard-based interface allows you to save procedures to reuse later with the click of a button. More...