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I want to run a logistic regression with multiple variables modelled with splines and some of those splines involved with interactions (Enterprise Guide 7.15). From the documentation (https://documentation.sas.com/?docsetId=casecon&docsetTarget=viyaets_introcom_sect010.htm&docsetVersion=8.1&locale=en), I thought that I would achieve this by using the 'separate' option and then refer to the spline variables as spl_x1, spl_x2 (as per below), but I get an error: "Variable spl_x1 not found"   proc logistic data=data;   effect spl = spline(x1 x2 / separate details naturalcubic basis=tpf(noint) knotmethod=percentilelist(5 27.5 50 72.5 95));   class x3;   model y = spl_x1 spl_x2 spl_x1*x3 / link = probit; run;     ... View more