https://communities.sas.com/t5/SAS-Procedures/How-to-write-a-contrast-statement-in-proc-mixed/m-p/77036#M22320 maybe:<BR /> <BR /> Contrast 'p2s5 vs p3s2' intercept 0 pretrt 0 1 -1 stain 0 -1 0 0 1 pretrt*stain 0 0 0 0 0 0 0 0 0 1 0 -1 0 0 0<BR /> ? Tue, 17 Mar 2009 12:15:11 GMT natapata 2009-03-17T12:15:11Z https://communities.sas.com/t5/SAS-Procedures/How-to-write-a-contrast-statement-in-proc-mixed/m-p/77035#M22319 Hi, I am having a most difficult time writing contrast/estimate statements and hope someone can help me with my error.<BR /> Background: I want to learn if the means of (pretrt=2 stain=5) and (pretrt=3 and stain =2) are equal.<BR /> <BR /> This is how I wrote the statement.<BR /> <BR /> Contrast 'p2s5 vs p3s2' intercept 0 pretrt 0 1 -1 stain 0 -1 0 0 1 pretrt*stain 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0<BR /> <BR /> Thank you. I am consistently getting wrong answers when I write these statements.<BR /> I guess it is good I'm consistent.... Tue, 17 Mar 2009 01:17:44 GMT https://communities.sas.com/t5/SAS-Procedures/How-to-write-a-contrast-statement-in-proc-mixed/m-p/77035#M22319 N2Nutrition 2009-03-17T01:17:44Z https://communities.sas.com/t5/SAS-Procedures/How-to-write-a-contrast-statement-in-proc-mixed/m-p/77036#M22320 maybe:<BR /> <BR /> Contrast 'p2s5 vs p3s2' intercept 0 pretrt 0 1 -1 stain 0 -1 0 0 1 pretrt*stain 0 0 0 0 0 0 0 0 0 1 0 -1 0 0 0<BR /> ? Tue, 17 Mar 2009 12:15:11 GMT https://communities.sas.com/t5/SAS-Procedures/How-to-write-a-contrast-statement-in-proc-mixed/m-p/77036#M22320 natapata 2009-03-17T12:15:11Z