Add Lowess Smoother
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Editor > Add > Smoother

Use to add a lowess smoother to an active scatterplot, matrix plot, histogram, or time series plot. You can use a lowess smoother to explore the relationship between two variables without fitting a specific model.

After creating a graph, you can change the lowess smoothing parameters, add groups, and change the fitted line attributes (see Editing Data Fits Overview).

Dialog box items

Lowess Smoothing Parameters

Degree of smoothing: Enter a number between 0 and 1 for the fraction (f) of the total number of points to use to calculate the fitted values at each x-value. The default is 0.5. See Specifying lowess smoothing parameters.

Number of steps: Enter a number from 0 to 10 to specify the number of iterations of smoothing to use to limit the influence of outliers. Each step reduces the weight given to outliers in the next iteration. The default is 2. See Specifying lowess smoothing parameters.

Apply same groups of current displays to lowess smoother: Check to use the same grouping variables for the fitted line as are used for all other data displays.