Smooth

The Smooth pane is briefly described below.

• Original data set -- Select the data set you want to smooth.
• Smoothed data set -- Specify the name of the smoothed data set. Note that the process of smoothing the original data set always produces a new data set containing smoothed response values.
• Method -- Select the smoothing method. Each response value is replaced with a smoothed value that is calculated by the specified smoothing method.
• Moving average -- Filter the data by calculating an average.
• Lowess -- Locally weighted scatter plot smooth using linear least squares fitting and a first-degree polynomial.
• Loess -- Locally weighted scatter plot smooth using linear least squares fitting and a second-degree polynomial.
• Savitzky-Golay -- Filter the data with an unweighted linear least squares fit using a polynomial of the specified degree.
• Robust Lowess -- Lowess method that is resistant to outliers.
• Robust Loess -- Loess method that is resistant to outliers.
• Span -- The number of data points used to compute each smoothed value.

• For the moving average and Savitzky-Golay methods, the span must be odd. For all locally weighted smoothing methods, if the span is less than 1 it is interpreted as the percentage of the total number of data points.

• Degree -- The degree of the polynomial used in the Savitzky-Golay method. The degree must be smaller than the span.
• Smoothed data sets -- Lists all the smoothed data sets. You add a smoothed data set to the list by clicking the Create smoothed data set button. When you select a data set from the list, you can perform these actions:
• Click View to open the View Data Set GUI. Using this GUI, you can view a single data set both graphically and numerically. Additionally, you can display data points to be excluded in a fit by selecting an exclusion rule.
• Click Rename to change the name of a single data set.
• Click Delete to delete one or more data sets. To select multiple data sets, you can use the Ctrl key and the mouse to select data sets one by one, or you can use the Shift key and the mouse to select a range of data sets.
• Click Save to workspace to save a single data set to a structure.