1. Carefully read the articles. Pay attention to phrases like "if you are using a procedure that does not support the EFFECT statement..."
2. Use PROC GLMSELECT to output the design matrix for your model, which includes the spline effects
3. Use PROC SURVEYLOGISTIC to analyze the design matrix, which includes the spline effects.
If you have additional question, please open a NEW thread and post the SURVEYLOGISTIC code that you want to produce, along with a description of which variable(s) should use spline effects.
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