Data strawb; input row column irrig $ weight; datalines; 1 1 drip 51 1 2 over 119 1 3 none 60 2 1 none 98 2 2 drip 43 2 3 over 31 3 1 over 99 3 2 none 87 3 3 drip 49 ; run; proc glm; class row column irrig; model weight = row column irrig; title 'Strawberry Irrigation Latin Square Experiment'; run;