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Smoothing using Savitzky-Golay Filtering

The Savitzky-Golay filter method essentially performs a local polynomial regression to determine the smoothed value for each data point. This method is superior to adjacent averaging because it tends to preserve features of the data such as peak height and width, which are usually 'washed out' by adjacent averaging.

Origin and Savitzky-Golay Filtering...

Origin provides two ways to access the Savitzky-Golay filter operation: Analysis:Smoothing:Savitzky-Golay or the Smoothing tool (Tools:Smooth).

Selecting the Analysis menu opens the Smoothing dialog box.

Origin's Smoothing dialog

 

Improve the fitting/differentiation by changing the Polynomial Order.

The Points to the Left and Points to the Right drop-down lists tell Origin how many points to the left and right to consider when looking at each individual point during the smoothing routine. You can make this smoothing window asymmetric about each data point by entering different values for each.

The Smoothing dialog also provides a control for changing the resultant curve color.

Finally, the dialog's "Apply" feature allows you to perform multiple smoothing operations without ever having to leave the dialog.

 

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