https://communities.sas.com/t5/Statistical-Procedures/Question-about-robustreg/m-p/76642#M3658 I am trying to figure out how to test parameters while using robust regressions (proc robustreg). That is, I would like to compare the values of several parameters with each other. <BR /> <BR /> For a standard OLS model, one can write<BR /> <BR /> test X1-X2=X3-X4; OR<BR /> text X1-X2-X3+X4;<BR /> <BR /> Neither works for me. Any suggestions? Fri, 23 Oct 2009 20:31:07 GMT CBL 2009-10-23T20:31:07Z https://communities.sas.com/t5/Statistical-Procedures/Question-about-robustreg/m-p/76642#M3658 I am trying to figure out how to test parameters while using robust regressions (proc robustreg). That is, I would like to compare the values of several parameters with each other. <BR /> <BR /> For a standard OLS model, one can write<BR /> <BR /> test X1-X2=X3-X4; OR<BR /> text X1-X2-X3+X4;<BR /> <BR /> Neither works for me. Any suggestions? Fri, 23 Oct 2009 20:31:07 GMT https://communities.sas.com/t5/Statistical-Procedures/Question-about-robustreg/m-p/76642#M3658 CBL 2009-10-23T20:31:07Z