The following error might be issued in the SAS^® log when you create a graph with the SGLOT procedure:

ERROR: The value eval(sort(variable-name, RETAIN=ALL)) is not a valid SAS name.

The problem occurs when you use an attribute map data set and specify the GROUP= option in a fit plot statement, such as LOESS, REG, or PBSPLINE.

To circumvent the problem, sort the data set by the GROUP= variable prior to the PROC SGPLOT step.

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