Data Smoothing: Loess

The Output Variables Tab

You can use the Output Variables tab (Figure 18.12) to add analysis variables to the data table. If you request a plot that uses one of the output variables, then that variable is automatically created even if you did not explicitly select the variable on the Output Variables tab.

The following list describes each output variable and indicates how it is named. y represents the name of the response variable.

Predicted values
adds predicted values. The variable is named LoessP_y.
Confidence limits for means
adds 95% confidence limits for the expected value (mean). The variables are named LoessLclm_y and LoessUclm_y.
Raw residuals
adds residuals, calculated as observed minus predicted values. The variable is named LoessR_y.


ugsmoothloessoutputtab.png (6966 bytes)

Figure 18.12: The Output Variables Tab


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